![]() The two knight mate has occurred several times in grand master games. Believe it or not white mates in 17 moves in this position! Good luck ever figuring this out over the board with your clock running in a tournament. If you ever wanted to see how white can check mate with two knights when black has a pawn, play thru this example. If side with the two knights captures the other side’s extra material, the game turns into the normal two knights endgame, and the opportunity to force checkmate is lost. The extra material gives the winning side just enough time to mate instead of stalemate. Seems that another move is always available.Īmazingly, although the king and two knights cannot force checkmate of the lone king, there are positions in which the king and two knights can force checkmate against a king and some additional material, like a pawn. White could try:Īnd now if Black moves 4…Kh8? then 5.Nf7# is checkmate, but if Black movesĪll black has to do is simply avoid moving into a position in which he or she can be checkmated on the next move. ![]() As we see in this position, 1.Ne7 or 1.Nh6 immediately stalemates Black. In order for white to win this position, black will have to make a blunder. However, it is not possible to force black into such a situation. In the above position we see that the black king is indeed in checkmate. Interesting is although two knights cannot force checkmate, three knights can! But very doubtful you would ever end up with three knights vs. Grand Master Edmar Mednis once stated that the inability to force checkmate with two knights is “one of the great injustices of chess”. With just easy defense, the lone king can just walk away from the knights and be safe. Although there are many checkmate positions with two knights on the board, you can not force mate. But as you can see, having two knights is not on the list.Ī king and two knights cannot force checkmate against a lone king. If you have just the bare minimum material on the board you can still mate. King and queen, king and rook, king and two bishops, and king and bishop and knight. While bp.intersection(wp).One of the first things you find out when you start learning about chess is that there are four basic mates. Let bstr = readLine()?.components(separatedBy: " ") Let wstr = readLine()?.components(separatedBy: " ") Let mnstr = readLine()?.components(separatedBy: " ") I was thinking of somehow creating an adjacency list for two horses, where the vertices are all the calculated positions of the horse use BFS, or the Dijkstra algorithm. I decided that it would not work that way to solve this problem, so I looked at the algorithms that are usually used in such tasks. I tried to create a function with recursion in which it was possible to call this loop if a match has not yet been found, but I failed. However, I have encountered such a problem that I cannot automate the process of running this loop inside the loop, I cannot know the number of times that this loop needs to be run. At the same time, the moves are counted and it is also output. Then run the same cycle inside of the current. Since I'm new to algorithms and data structures, I tried to solve this problem like this: run for loop on all 64 possible combinations of two moves of a white and black knight, make a move for each knight (checking if it goes beyond the scope), check if there is a match and, if there is, then output it. If the knights can never be placed in the same square, print -1. Print a single number - the number of moves required to complete the game. The first coordinate is in the range from 1 to M, the second is in the range from 1 to N. The second and third lines contain the coordinates of the cells in which the white and black knight are located, respectively. The first line of the file contains the values M and N (2≤M,N≤1000). The goal of the game is to place both horses in the same cell as quickly as possible. The knights take turns making moves in accordance with the rules of the chess knight's movement (the white knight goes first). Each knight is located in the it's cell, but it is possible that both knights are in the same cell. On a chessboard consisting of M rows and N columns (for example, 8x10), there are two knights, the user enters their coordinates himself (for example, (2, 4) is a white knight and (7, 9) is a black knight).
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