func max(nodes []TreeNode, depth int, depthLimit int, roundColor int) *TreeNode {
//console.log("in max: , nodes are: ", nodes);
// max 展开的节点，表明当前的评估分数，和要得出步骤的棋子颜色相同
var minNodes []TreeNode
var maxNode TreeNode
for _, node := range nodes {
// 如果此展开的节点已吃了对方老帅，则直接返回
if boardHelper.GeneralBeTaken(node.Board, node.RoundColor) {
return &node
}
if depth == depthLimit {
node.Score = boardHelper.Evaluate(node.Board) * roundColor
minNodes = append(minNodes, node)
} else {
minNodes = append(minNodes, *min(expandNode(node, roundColor*-1), depth+1, depthLimit, roundColor))
}
}
// find the max node in the minNodes
maxScore := -SCORE_WIN_LIMIT
for _, node := range minNodes {
//fmt.Printf("\n++for each max, min score is: %d with move %s\n", node.Score, node.Parent.Move)
if node.Score > maxScore {
maxNode = node
maxScore = node.Score
}
}
//fmt.Printf("\n\n\n ____MaxScore is %d and MaxNode Parent Move is %s.\n", maxScore, maxNode.Parent.Move)
// 如果没有可展开结点，即被完全憋死了（如3aga3/3ShS3/4S4/9/9/9/9/9/9/4G4，如轮到黑，则完全没有可走之步)
//另一局，7子： (9/3ShS3/3aga3/9/9/9/9/9/9/3G5) // TODO
//maxNode.Parent.Score = maxNode.Score
if depth == 1 {
return maxNode.Parent
}
return &maxNode
}
func min(nodes []TreeNode, depth int, depthLimit int, roundColor int) *TreeNode {
var maxNodes []TreeNode
var minNode TreeNode
for _, node := range nodes {
// 如果此展开的节点自己老帅被吃了，则直接返回最小值
if boardHelper.GeneralBeTaken(node.Board, node.RoundColor) {
node.Score = -SCORE_WIN_LIMIT
return &node
}
if depth == depthLimit {
node.Score = boardHelper.Evaluate(node.Board) * roundColor
//fmt.Printf("======min node score is %d and board fen is %s=====", node.Score, boardHelper.Board2Fen(node.Board))
maxNodes = append(maxNodes, node)
} else {
maxNodes = append(maxNodes, *max(expandNode(node, roundColor), depth+1, depthLimit, roundColor))
}
}
// find the min node in the minNodes
minScore := SCORE_WIN_LIMIT
for _, node := range maxNodes {
if node.Score < minScore {
minNode = node
minScore = node.Score
}
}
//fmt.Printf("minNode is %q with score: %d.", minNode, minScore)
// minNode.Parent.Score = minNode.Score
//fmt.Printf("min node move is %s and score is %d.", minNode.Move, minNode.Score)
//if depth == depthLimit {
return &minNode
//} else {
// return minNode.Parent
//}
}