The Diamond Mine

Read-only starter

The Diamond Mine is intended to expose the deeper machinery of Tetgame Rabbots: behavior files, scoring nudges, strategy filters, voice loaders, backups, and eventually safe editing tools.

/*
 * Tetgame Rabbot: Hamilton Marteau
 *
 * Hamilton v13 — center-mouth containment and anti-sting root net. Tetgame supplies legal moves in
 * ctx.tokenMoves and ctx.tetMoves; this file only chooses among those legal moves.
 *
 * v13 notes:
 * - v12 finally made Hamilton swim, but it made him patrol the new outer tet
 *   while Buzz kept harvesting the root tet.
 * - v13 gives Hamilton a stricter center-mouth rule: if the board is still
 *   young, he may swim once, but his next bites come back to the root corners
 *   before Buzz can build the red sting wheel.
 * - When Hamilton starts, he now takes the center socket first.  When Buzz
 *   starts with center, Hamilton answers with corner containment instead of
 *   the old 0-then-wander pattern.
 * Voice lines live separately in js/voices/hamilton_marteau.json.
 */
(function(global){
  'use strict';

  const registry = global.TetgameRabbotBrains = global.TetgameRabbotBrains || {};

  function cloneMove(move, fallbackReason){
    if (!move) return null;
    const copy = Object.assign({}, move);
    if (!copy.reason && fallbackReason) copy.reason = fallbackReason;
    return copy;
  }

  function moveAt(list, index){
    return Array.isArray(list) && list.length > index ? list[index] : null;
  }

  function pass(reason){
    return {type:'pass', score:-1, reason:reason || 'no legal action found'};
  }

  function scoreOf(move){
    return Number(move && move.score || 0);
  }

  function moveTetId(move){
    return Number(move && move.socket && move.socket.metadata ? move.socket.metadata.tetId : -1);
  }

  function socketIndex(move){
    return Number(move && move.socket && move.socket.metadata ? move.socket.metadata.socketIndex : -1);
  }

  function isCornerSocket(idx){
    return idx >= 0 && idx <= 3;
  }

  function isEdgeMidSocket(idx){
    return idx >= 4 && idx <= 9;
  }

  function isCenterSocket(idx){
    return idx === 10;
  }

  function hammerShapeBias(move){
    const idx = socketIndex(move);
    const raw = scoreOf(move);
    let value = 0;

    // Hamilton v9: favor stable hammerhead anchors.  The edge-midpoint
    // sockets can still be taken when they are genuinely rich, but they no
    // longer win every close comparison just because they are nearby.
    if (isCenterSocket(idx)) value += 2.15;
    if (isCornerSocket(idx)) value += 1.70;
    if (isEdgeMidSocket(idx)) value -= raw >= 8 ? 0.55 : 2.20;

    return value;
  }

  function activeCount(ctx){
    return Math.max(2, Number(ctx && ctx.activeCount || 2));
  }

  function newestTokenTetId(ctx){
    const moves = Array.isArray(ctx && ctx.tokenMoves) ? ctx.tokenMoves : [];
    let newest = Math.max(1, Number(ctx && ctx.tetCount || 1));
    moves.forEach(move => {
      const id = moveTetId(move);
      if (id > newest) newest = id;
    });
    return newest;
  }

  function chooseWideTet(ctx){
    const moves = Array.isArray(ctx && ctx.tetMoves) ? ctx.tetMoves : [];
    if (!moves.length) return null;

    // Look past the first legal placement so Hamilton behaves like a shark,
    // circling out to wider water instead of nosing only the nearest reef.
    const lookCount = Math.min(moves.length, Math.max(4, Math.min(8, activeCount(ctx) + 4)));
    let best = moves[0];
    let bestValue = -999999;

    for (let i = 0; i < lookCount; i++) {
      const move = moves[i];
      if (!move) continue;
      let value = scoreOf(move);
      const faceIndex = Number(move && move.face && move.face.metadata ? move.face.metadata.faceIndex : -1);

      // If future tet placement candidates are ever exposed through socket-like
      // anchors, avoid edge-midpoints there too.  Current face indices are
      // usually 0-3, so this is a harmless guardrail.
      if (isCornerSocket(faceIndex) || isCenterSocket(faceIndex)) value += 0.45;
      if (isEdgeMidSocket(faceIndex)) value -= 3.25;

      // Small range bonus: enough to break repetitive nearest-face choices,
      // not enough to ignore a clearly superior legal placement.
      value += i * 0.72;
      if (i >= 2) value += 1.05;
      if (i >= 4) value += 0.65;
      if (i >= 6) value -= 0.25;

      if (value > bestValue) {
        bestValue = value;
        best = move;
      }
    }

    return best;
  }

  function bestTokenOnTet(moves, wantedTetId){
    if (!Array.isArray(moves) || wantedTetId < 1) return null;
    let best = null;
    let bestValue = -999999;

    moves.forEach((move, i) => {
      if (moveTetId(move) !== wantedTetId) return;

      const idx = socketIndex(move);
      let value = scoreOf(move);

      // Guard sockets that commonly turn into cross-tet raids.  v9 treats
      // corners and centers as strong anchors, while edge-midpoints are suspect
      // unless the raw capture score already proves they are worth it.
      value += hammerShapeBias(move);
      if (idx === 10) value += 0.55;
      if (isCornerSocket(idx)) value += 0.35;

      value -= i * 0.02;

      if (value > bestValue) {
        bestValue = value;
        best = move;
      }
    });

    return best;
  }

  function chooseFreshWaterGuard(ctx){
    const moves = Array.isArray(ctx && ctx.tokenMoves) ? ctx.tokenMoves : [];
    if (!moves.length) return null;

    const tetCount = Number(ctx && ctx.tetCount || 0);
    if (tetCount < 3) return null;

    const top = moves[0];
    const topScore = scoreOf(top);
    const newest = bestTokenOnTet(moves, tetCount);
    const nextNewest = bestTokenOnTet(moves, tetCount - 1);

    // If the newest tet exists, Hamilton should patrol it unless the best
    // available bite is already a clearly rich capture.  This is aimed exactly
    // at the Buzz pattern where the third tet becomes a late red payday.
    if (newest) {
      const newestScore = scoreOf(newest);
      const topIsRich = topScore >= 9.5;
      const newestIsClose = newestScore >= topScore - 2.75;
      const topIsRootNibble = moveTetId(top) === 1 && topScore < 6.5;
      const newestIsWorthIt = newestScore >= 4.5;

      if (!topIsRich && newestIsWorthIt && (newestIsClose || topIsRootNibble || topScore <= 4.5)) {
        return cloneMove(newest, 'patrol the fresh outer water before Buzz can sting it');
      }
    }

    // After the freshest tet is guarded, do not abandon the adjacent outer reef
    // for a low-value center nibble.
    if (nextNewest && moveTetId(top) === 1 && topScore <= 6.5) {
      return cloneMove(nextNewest, 'circle back through the deeper reef');
    }

    return null;
  }

  function chooseMouthGuardToken(ctx){
    const moves = Array.isArray(ctx && ctx.tokenMoves) ? ctx.tokenMoves : [];
    if (!moves.length) return null;

    const tetCount = Number(ctx && ctx.tetCount || 0);
    if (tetCount < 2) return null;

    const top = moves[0];
    const topScore = scoreOf(top);
    const topTet = moveTetId(top);
    const root = bestTokenOnTet(moves, 1);
    if (!root) return null;

    const rootScore = scoreOf(root);

    // Buzz repeatedly wins by letting Hamilton build the reef, then harvesting
    // the root tet.  If a center-mouth socket is nearly as good as the current
    // best move, Hamilton should take it before the bee turns it into a hive.
    if (tetCount >= 3 && rootScore >= topScore - 2.25) {
      return cloneMove(root, 'guard the mouth before the stinger gets inside');
    }

    // A genuinely rich root socket is not bait; it is dinner.
    if (tetCount >= 3 && rootScore >= 7.0) {
      return cloneMove(root, 'bite the glowing center joint');
    }

    // In big water, do not swim past a useful center block for a small outer nibble.
    if (tetCount >= 4 && topTet > 1 && topScore <= rootScore + 3.0 && rootScore >= 5.5) {
      return cloneMove(root, 'turn back and protect the center channel');
    }

    return null;
  }



  // v13: socket order matters.  Hamilton should take the center if he
  // starts the fight.  If Buzz already owns the center, Hamilton should not
  // answer with the old 0-then-swim habit; he needs corner containment first.
  const ROOT_CENTER_START = [10, 1, 2, 3, 0, 7, 8, 9, 4, 5, 6];
  const ROOT_COUNTER_STING = [1, 2, 3, 0, 10, 7, 8, 9, 4, 5, 6];
  const ROOT_JAW_LOCKED  = [1, 2, 3, 0, 10, 7, 8, 9, 4, 5, 6];
  const ROOT_CONTAINMENT = [2, 1, 3, 0, 7, 8, 9, 4, 5, 6, 10];
  const OUTER_JAW        = [10, 0, 3, 1, 2, 6, 9, 4, 5, 7, 8];

  function exactSocketMove(moves, tetId, socketOrder, minRawScore, reasonPrefix){
    if (!Array.isArray(moves) || tetId < 1) return null;
    const bySocket = Object.create(null);

    moves.forEach(move => {
      if (moveTetId(move) !== tetId) return;
      const idx = socketIndex(move);
      if (idx < 0) return;
      if (!bySocket[idx] || scoreOf(move) > scoreOf(bySocket[idx])) bySocket[idx] = move;
    });

    for (let i = 0; i < socketOrder.length; i++) {
      const idx = socketOrder[i];
      const move = bySocket[idx];
      if (!move) continue;
      if (typeof minRawScore === 'number' && scoreOf(move) < minRawScore) continue;
      return cloneMove(move, reasonPrefix + ' socket ' + tetId + ':' + idx);
    }

    return null;
  }


  function chooseRootContainmentToken(ctx){
    const moves = Array.isArray(ctx && ctx.tokenMoves) ? ctx.tokenMoves : [];
    if (!moves.length || activeCount(ctx) > 2) return null;

    const tetCount = Number(ctx && ctx.tetCount || 0);
    const tokenCount = Number(ctx && ctx.tokenCount || 0);
    if (tetCount < 2 || tetCount > 3 || tokenCount > 16) return null;

    const rootWall = exactSocketMove(
      moves,
      1,
      ROOT_CONTAINMENT,
      -999,
      'close the center-mouth net at'
    );
    if (!rootWall) return null;

    const top = moves[0];
    const topScore = scoreOf(top);
    const rootScore = scoreOf(rootWall);
    const topTet = moveTetId(top);

    // This is the key v13 correction.  v12 saw a legal outer bite and kept
    // swimming.  Buzz then harvested the root tet.  Unless the outer move is
    // already a very large capture, Hamilton must spend the young game denying
    // root corners and root auto-edge pairs.
    if (topTet === 1) return rootWall;
    if (tokenCount <= 10) return rootWall;
    if (topScore < 10.0) return rootWall;
    if (rootScore >= topScore - 4.5) return rootWall;

    return null;
  }

  function chooseObjectiveBiteToken(ctx){
    const moves = Array.isArray(ctx && ctx.tokenMoves) ? ctx.tokenMoves : [];
    if (!moves.length || activeCount(ctx) > 2) return null;

    const tetCount = Number(ctx && ctx.tetCount || 0);
    const tokenCount = Number(ctx && ctx.tokenCount || 0);
    const boardLocked = !!(ctx && ctx.boardLocked);
    const newest = newestTokenTetId(ctx);

    // v13: exact opening jaw with context.  If Hamilton starts on an empty
    // root, he takes the center.  If Buzz already started there, Hamilton
    // answers with corner containment so Buzz cannot dance around the mouth.
    if (tetCount === 1 && tokenCount <= 0) {
      return exactSocketMove(
        moves,
        1,
        ROOT_CENTER_START,
        -999,
        'claim the center-mouth first at'
      );
    }

    if (tetCount === 1 && tokenCount <= 3) {
      return exactSocketMove(
        moves,
        1,
        ROOT_COUNTER_STING,
        -999,
        'counter the center sting at'
      );
    }

    // Once the first few marks are down, keep finishing the root jaw by exact
    // positions unless a later capture is already stronger elsewhere.
    if (tetCount === 1 && tokenCount <= 10) {
      return exactSocketMove(
        moves,
        1,
        ROOT_JAW_LOCKED,
        2.0,
        'finish the root-jaw map at'
      );
    }

    // If there is fresh water, do not abandon the mouth too early.  In the
    // losing v12 records Hamilton filled tet 2 while Buzz harvested tet 1.
    // v13 therefore checks root containment before outer patrol during the
    // young two-tet fight.
    if (tetCount >= 2 && tokenCount <= 14) {
      const rootWall = chooseRootContainmentToken(ctx);
      if (rootWall) return rootWall;

      const fresh = exactSocketMove(
        moves,
        newest,
        OUTER_JAW,
        boardLocked ? 2.0 : 3.0,
        'bite the fresh-water socket at'
      );
      if (fresh) return fresh;

      return exactSocketMove(
        moves,
        1,
        ROOT_JAW_LOCKED,
        3.0,
        'deny Buzz the root socket at'
      );
    }

    // Midgame: patrol the newest tet by the same objective order, but require
    // that the move has some real value so Hamilton does not ignore a rich bite.
    if (tetCount >= 3 && tokenCount <= 24) {
      return exactSocketMove(
        moves,
        newest,
        OUTER_JAW,
        4.5,
        'patrol the named deep socket at'
      );
    }

    return null;
  }


  function chooseOpeningMouthBlock(ctx){
    const moves = Array.isArray(ctx && ctx.tokenMoves) ? ctx.tokenMoves : [];
    if (!moves.length) return null;

    let best = null;
    let bestValue = -999999;

    moves.forEach((move, i) => {
      if (moveTetId(move) !== 1) return;

      const idx = socketIndex(move);
      let value = scoreOf(move);

      // Buzz's sting pattern begins with the center mouth.  In a duel, a
      // first-reply block on the root tet is more valuable than its raw score
      // suggests, but v9 should not answer the sting by handing Buzz an
      // edge-midpoint ladder.
      value += hammerShapeBias(move);
      if (isCornerSocket(idx)) value += 2.90;
      if (idx === 1 || idx === 2 || idx === 3) value += 0.70;
      if (idx === 0) value += 0.45;
      if (isCenterSocket(idx)) value += 1.25;
      if (isEdgeMidSocket(idx)) value -= 0.95;

      value -= i * 0.025;

      if (value > bestValue) {
        bestValue = value;
        best = move;
      }
    });

    return best;
  }

  function chooseHammerToken(ctx){
    const moves = Array.isArray(ctx && ctx.tokenMoves) ? ctx.tokenMoves : [];
    if (!moves.length) return null;

    const tetCount = Number(ctx && ctx.tetCount || 0);
    const newest = newestTokenTetId(ctx);
    let best = moves[0];
    let bestValue = -999999;

    moves.forEach((move, i) => {
      let value = scoreOf(move);
      const id = moveTetId(move);
      const idx = socketIndex(move);

      // Once Hamilton has opened water, make him hunt there, but do not
      // abandon the center mouth. v6 over-weighted the newest tet so hard that
      // Buzz farmed root sockets into red storms.
      if (id > 1) value += 0.85;
      if (id === newest && tetCount > 1) value += 1.25;
      if (tetCount >= 3 && id === tetCount) value += 1.25;
      if (tetCount >= 4 && id === tetCount - 1) value += 0.85;
      if (id === 1 && tetCount > 2) value += scoreOf(move) >= 6 ? 1.35 : -0.75;
      if (id === 1 && tetCount > 3 && scoreOf(move) < 5) value -= 0.75;
      if (id > 1 && scoreOf(move) < 4.5) value -= 2.00;

      // A little hammerhead shape sense. Corners and centers build better
      // hammerhead leverage; edge-midpoints are usually stepping stones for
      // Buzz unless they are already rich captures.
      value += hammerShapeBias(move);
      if (isCornerSocket(idx)) value += 0.75;
      if (isCenterSocket(idx)) value += 0.85;

      // Keep genuinely rich sockets genuinely attractive.
      if (scoreOf(move) >= 8) value += 2.00;
      if (scoreOf(move) >= 12) value += 3.50;

      // Preserve sorted-list stability when values are nearly equal.
      value -= i * 0.03;

      if (value > bestValue) {
        bestValue = value;
        best = move;
      }
    });

    return best;
  }

  function canOpen(ctx){
    return ctx && ctx.tetCount <= 0;
  }

  function openingLimit(ctx, extra){
    const active = Number(ctx && ctx.activeCount || 2);
    return Math.max(2, Math.min(5, active + Number(extra || 1)));
  }

  registry.hamilton_marteau = {
    key:'hamilton_marteau',
    id:'hamilton_marteau',
    name:'Hamilton Marteau',
    level:1,
    style:'center-mouth containment, then hammerhead patrol',
    temperament:'takes center when starting, answers Buzz with root-corner containment, swims once, then returns to deny the sting wheel',

    chooseMove(ctx){
      if (!ctx || ctx.matchEnded || ctx.tournamentEnded) return null;
      if (canOpen(ctx)) return {type:'start_tet', score:1000, reason:'open the first position'};

      const token0 = moveAt(ctx.tokenMoves, 0);
      const token1 = moveAt(ctx.tokenMoves, 1);
      const token2 = moveAt(ctx.tokenMoves, 2);
      const tet0 = moveAt(ctx.tetMoves, 0);
      const tet1 = moveAt(ctx.tetMoves, 1);
      const boardLocked = !!ctx.boardLocked;
      const firstAction = Number(ctx.turnActionCount || 0) === 0;
      const tetCount = Number(ctx.tetCount || 0);

      switch ('hammer') {
        case 'opportunist':
          if (token0 && Number(token0.score || 0) >= 6) return cloneMove(token0, 'take the exposed opening');
          if (!boardLocked && tet0 && firstAction && tetCount < openingLimit(ctx, 2)) return cloneMove(tet0, 'spread the shadow line');
          return cloneMove(token0, 'take the available mark') || cloneMove(tet0, 'expand where the board loosens') || pass();

        case 'territorial':
          if (!boardLocked && tet0 && firstAction && tetCount < openingLimit(ctx, 3)) return cloneMove(tet0, 'build a lasting border');
          if (token0 && Number(token0.score || 0) >= 7) return cloneMove(token0, 'seal the valuable point');
          return cloneMove(tet0, 'extend the territory') || cloneMove(token0, 'hold the ground') || pass();

        case 'mirror':
          if (token1 && Number(token0 && token0.score || 0) - Number(token1.score || 0) <= 2) return cloneMove(token1, 'answer from the echo line');
          if (!boardLocked && tet1 && firstAction && tetCount < openingLimit(ctx, 1)) return cloneMove(tet1, 'repeat the board at an angle');
          return cloneMove(token0, 'answer the strongest pattern') || cloneMove(tet0, 'echo the expansion') || pass();

        case 'scramble':
          if (token0) return cloneMove(token0, 'dart into the loose opening');
          if (!boardLocked && (tet1 || tet0)) return cloneMove(tet1 || tet0, 'skitter to new ground');
          return pass();

        case 'stinger':
          if (token0 && Number(token0.score || 0) >= 5) return cloneMove(token0, 'strike the live socket');
          if (!boardLocked && tet0 && firstAction && tetCount < openingLimit(ctx, 1)) return cloneMove(tet0, 'open a sharper lane');
          return cloneMove(token0, 'sting the nearest point') || cloneMove(tet0, 'move the pressure forward') || pass();

        case 'hammer': {
          // Hamilton v10: v9 still let Hamilton swim first when he was the
          // starter.  Bite before swimming so Buzz does not get a free branch
          // to turn into a red stinger farm.
          const bestTokenScore = scoreOf(token0);
          const duel = activeCount(ctx) <= 2;
          const waterTarget = duel ? 3 : Math.max(openingLimit(ctx, 4), activeCount(ctx) >= 4 ? 6 : 5);
          const waterTet = chooseWideTet(ctx) || tet0;
          const tokenCount = Number(ctx.tokenCount || 0);
          const emptyTokenBoard = tokenCount <= 0;
          const starterSecondAction = duel && !firstAction && tetCount === 1 && emptyTokenBoard;

          // v12 correction: v11's named-socket map was too obedient.  In
          // Buzz-start games Hamilton took two root tokens in a row, locked
          // the board, and never got to be a shark.  After one real bite on
          // the root tet, force the next action to swim if a tet placement is
          // still legal.  Only ignore this for a truly huge immediate capture.
          if (!boardLocked && duel && !firstAction && tetCount === 1 && tokenCount > 0 && waterTet && bestTokenScore < 12) {
            return cloneMove(waterTet, 'one bite is enough; swim before the jaw locks');
          }

          const objectiveBiteToken = chooseObjectiveBiteToken(ctx);
          const mouthGuardToken = objectiveBiteToken ? null : chooseMouthGuardToken(ctx);
          const freshGuardToken = (objectiveBiteToken || mouthGuardToken) ? null : chooseFreshWaterGuard(ctx);
          const openingMouthBlock = (duel && tetCount === 1 && token0 && (firstAction || starterSecondAction)) ? chooseOpeningMouthBlock(ctx) : null;
          const hammerToken = objectiveBiteToken || mouthGuardToken || freshGuardToken || openingMouthBlock || chooseHammerToken(ctx) || token0;
          const hammerTokenScore = scoreOf(hammerToken);
          const youngWater = tetCount < waterTarget;

          // If Hamilton is the starter, the center tet itself consumed action 1.
          // v9 treated action 2 as permission to swim, leaving no blue anchor.
          // That produced the 48-point Buzz blowouts.  v10 forces one bite
          // before any starter dive.
          if (starterSecondAction && hammerToken) {
            return cloneMove(hammerToken, 'anchor a blue bite before swimming wide');
          }

          // If Buzz has opened with the center sting, do not spend Hamilton's
          // first full reply on water only.  Bite the mouth first; then, if
          // the second action is still available, he can swim outward.
          if (objectiveBiteToken) {
            return cloneMove(objectiveBiteToken, 'use the named socket map instead of guessing');
          }

          if (openingMouthBlock && bestTokenScore < 9.75) {
            return cloneMove(openingMouthBlock, 'bite the mouth before swimming wide');
          }

          // After a real token bite, allow the second action to be a controlled
          // dive.  Do not count the automatic starting tet as that bite.
          if (!boardLocked && duel && !firstAction && tetCount < 2 && !emptyTokenBoard && waterTet && !objectiveBiteToken && hammerTokenScore < 10.5) {
            return cloneMove(waterTet, 'bite first, then swim to wider water');
          }

          // Dive, but not blindly.  In a two-player duel Hamilton may expand
          // once, or bite first and then expand once.  The forbidden pattern is
          // still the old double-expansion that let Buzz build a stinger farm.
          if (!boardLocked && waterTet && youngWater) {
            const trueHammerBlow = hammerToken && hammerTokenScore >= 14;
            const centerBait = !duel && hammerToken && moveTetId(hammerToken) === 1 && tetCount >= 3 && hammerTokenScore < 12;
            const stillTooShallow = tetCount < Math.max(duel ? 2 : 4, waterTarget - 1);
            const expandOnFirst = firstAction && bestTokenScore < (duel ? 9 : 13);
            const expandOnSecond = !firstAction && !duel && (stillTooShallow || centerBait) && hammerTokenScore < 13;

            if (!trueHammerBlow && !objectiveBiteToken && !mouthGuardToken && (expandOnFirst || expandOnSecond || centerBait || !hammerToken)) {
              return cloneMove(
                waterTet,
                stillTooShallow ? 'swim wider, then bite' : 'open one more deep-water lane'
              );
            }
          }

          // Once the board locks, patrol from the outside inward.
          if (hammerToken) {
            return cloneMove(
              hammerToken,
              freshGuardToken ? 'guard the deep outer water before Buzz can sting it' :
                (hammerTokenScore >= 8 ? 'bring the hammer down on the richest joint' : 'hunt the reef he opened')
            );
          }

          if (!boardLocked && waterTet) {
            return cloneMove(waterTet, 'push the shoreline outward');
          }

          return cloneMove(tet0, 'set a last heavy stone') || pass();
        }

        case 'glacier':
          if (token0 && Number(token0.score || 0) >= 8) return cloneMove(token0, 'freeze the high-value line');
          if (!boardLocked && tet0 && firstAction && tetCount < openingLimit(ctx, 2)) return cloneMove(tet0, 'advance the slow front');
          if (token1 && Number(token1.score || 0) >= 6) return cloneMove(token1, 'choose the colder second line');
          return cloneMove(token0, 'hold the cleanest point') || cloneMove(tet0, 'extend carefully') || pass();

        case 'fang':
          if (token0) return cloneMove(token0, Number(token0.score || 0) >= 7 ? 'bite the exposed line' : 'close on the nearest socket');
          if (!boardLocked && tet0) return cloneMove(tet0, 'move the fight closer');
          return pass();

        case 'trap':
          if (token2 && Number(token0 && token0.score || 0) - Number(token2.score || 0) <= 3) return cloneMove(token2, 'hide the threat in a quiet socket');
          if (token1 && Number(token0 && token0.score || 0) - Number(token1.score || 0) <= 2) return cloneMove(token1, 'set the second line');
          if (!boardLocked && tet0 && firstAction && tetCount < openingLimit(ctx, 2)) return cloneMove(tet0, 'fold the board into a trap');
          return cloneMove(token0, 'take the visible trapdoor') || cloneMove(tet0, 'open hidden space') || pass();

        case 'pistolero':
          if (token0 && Number(token0.score || 0) >= 4) return cloneMove(token0, 'draw on the bright target');
          if (!boardLocked && tet0 && firstAction && tetCount < openingLimit(ctx, 1)) return cloneMove(tet0, 'open the firing lane');
          return cloneMove(token0, 'take the fastest shot') || cloneMove(tet0, 'shift to a new angle') || pass();

        case 'flow':
        default:
          if (token0 && (!tet0 || Number(token0.score || 0) >= Number(tet0.score || 0) - 1)) return cloneMove(token0, 'follow the strongest current');
          if (!boardLocked && tet0) return cloneMove(tet0, 'open the next wave');
          return cloneMove(token0, 'settle into the available point') || pass();
      }
    }
  };
})(window);