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fs: 实现 超出边界(Fail-Soft) 的 Alpha-Beta 搜索

This commit is contained in:
Calcitem 2020-05-04 14:11:25 +08:00
parent f41c338e29
commit bb50055fda
1 changed files with 18 additions and 15 deletions
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33
src/ai/search.cpp
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@ -739,6 +739,7 @@ value_t AIAlgorithm::search(depth_t depth, value_t alpha, value_t beta, Node *no
// 评价值
value_t value;
node->value = -VALUE_INFINITE;
// 临时增加的深度，克服水平线效应用
depth_t epsilon;
@ -850,7 +851,7 @@ value_t AIAlgorithm::search(depth_t depth, value_t alpha, value_t beta, Node *no
#endif
if (unlikely(position->phase == PHASE_GAMEOVER) || // 搜索到叶子节点（决胜局面） // TODO: 对哈希进行特殊处理
!depth || // 搜索到第0层
depth <= 0 || // 搜索到第0层
unlikely(requiredQuit)) {
// 局面评估
node->value = Evaluation::getValue(st, position, node);
@ -978,28 +979,30 @@ value_t AIAlgorithm::search(depth_t depth, value_t alpha, value_t beta, Node *no
undoMove();
if (value >= beta) {
#ifdef TRANSPOSITION_TABLE_ENABLE
hashf = TT::hashfBETA;
#endif
node->value = beta;
goto out;
}
if (value >= node->value) {
node->value = value;
if (value > alpha) {
if (value > alpha) {
#ifdef TRANSPOSITION_TABLE_ENABLE
hashf = TT::hashfEXACT;
hashf = TT::hashfEXACT;
#endif
alpha = value;
alpha = value;
if (depth == originDepth) {
best = m;
if (depth == originDepth) {
best = m;
}
}
if (value >= beta) {
#ifdef TRANSPOSITION_TABLE_ENABLE
hashf = TT::hashfBETA;
#endif
node->value = beta;
goto out;
}
}
}
node->value = alpha;
out:
#ifdef DEBUG_AB_TREE