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 *  Set the counter-move for the move at the previous ply   *
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 *  Set the counter-move for the move at the previous ply   *
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 *  to be this move that caused the fail-high.              *
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 *  to be this move that caused the fail-high.              *
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 *                                                          *
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 *                                                          *
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 ************************************************************
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 ************************************************************
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 */
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 */
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    if (counter_move[tree->curmv[ply - 1] & 4095].move1 != move) {
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    if (tree->counter_move[tree->curmv[ply - 1] & 4095].move1 != move) {
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      counter_move[tree->curmv[ply - 1] & 4095].move2 =
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      tree->counter_move[tree->curmv[ply - 1] & 4095].move2 =
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          counter_move[tree->curmv[ply - 1] & 4095].move1;
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          tree->counter_move[tree->curmv[ply - 1] & 4095].move1;
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      counter_move[tree->curmv[ply - 1] & 4095].move1 = move;
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      tree->counter_move[tree->curmv[ply - 1] & 4095].move1 = move;
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    }
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    }
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/*
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/*
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 ************************************************************
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 ************************************************************
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 *                                                          *
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 *                                                          *
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 *  Set the move-pair for the move two plies back so that   *
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 *  Set the move-pair for the move two plies back so that   *
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 *  move to continue the "plan".                            *
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 *  move to continue the "plan".                            *
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 *                                                          *
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 *                                                          *
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 ************************************************************
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 ************************************************************
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 */
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 */
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    if (ply > 2) {
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    if (ply > 2) {
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      if (move_pair[tree->curmv[ply - 2] & 4095].move1 != move) {
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      if (tree->move_pair[tree->curmv[ply - 2] & 4095].move1 != move) {
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        move_pair[tree->curmv[ply - 2] & 4095].move2 =
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        tree->move_pair[tree->curmv[ply - 2] & 4095].move2 =
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            move_pair[tree->curmv[ply - 2] & 4095].move1;
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            tree->move_pair[tree->curmv[ply - 2] & 4095].move1;
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        move_pair[tree->curmv[ply - 2] & 4095].move1 = move;
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        tree->move_pair[tree->curmv[ply - 2] & 4095].move1 = move;
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      }
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      }
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    }
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    }
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/*
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/*
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 ************************************************************
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 ************************************************************
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 *                                                          *
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 *                                                          *
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 *  Adjust the history counter for the move that caused the *
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 *  Adjust the history counter for the move that caused the *
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 *  fail-high, limiting the max value to +2^20.             *
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 *  fail-high, limiting the max value to 2048.              *
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 *                                                          *
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 *                                                          *
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 ************************************************************
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 ************************************************************
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 */
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 */
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    if (depth > 5) {
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    if (depth > 5) {
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      mindex = HistoryIndex(side, move);
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      mindex = HistoryIndex(side, move);
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/*
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/*
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 ************************************************************
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 ************************************************************
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 *                                                          *
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 *                                                          *
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 *  Adjust the history counters for the moves that were     *
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 *  Adjust the history counters for the moves that were     *
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 *  searched but did not cause a fail-high, limiting the    *
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 *  searched but did not cause a fail-high, limiting the    *
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 *  min value to -2^20.                                     *
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 *  min value to 0.                                         *
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 *                                                          *
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 *                                                          *
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 ************************************************************
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 ************************************************************
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 */
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 */
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      for (i = 1; i <= searched[0]; i++) {
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      for (i = 1; i <= searched[0]; i++) {
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        index = HistoryIndex(side, searched[i]);
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        index = HistoryIndex(side, searched[i]);