Gentelmen, check your engines.

[mvanthoor]

My engine finds nothing. There are at least two errors in the given FEN-string. It is missing the EP and castling rights, and when I add them, my engine reports an error with regard to the square and piece part.

[dangi12012]

Well enumerating all positions does not give me any information if it contains a forced checkmate:
Depth: 7 - 3R1R2/K3k3/1p1nPb2/pN2P2N/nP1ppp2/4P3/6P1/4Qq1r w 0 1
Perft 1: 41 0ms 2.92857 MNodes/s
Perft 2: 1247 0ms 26.5319 MNodes/s
Perft 3: 49329 0ms 465.368 MNodes/s
Perft 4: 1555103 1ms 1263.28 MNodes/s
Perft 5: 62391367 33ms 1847.98 MNodes/s
Perft 6: 2005994595 1293ms 1551.04 MNodes/s
Perft 7: 80893669123 42991ms 1881.62 MNodes/s

forum3/viewtopic.php?f=7&t=78230
How would I implement a checkmate search?

[BrokenKeyboard]

You would go about doing that by implementing a basic minimax engine that returns the evaluation along with the depth the evaluation came from. Due to the way minimax works it forces both players to play optimally. To make it faster, use safe pruning methods such as alpha-beta, and then use a hashtable as well. The CPW has all the info you would need. You have the board representation, so go on and make a search and basic material evaluation. (White pieces values - black pieces values). When that's > 0, then white is "winning" , < 0 gets you black is winning.