Gen-mates

There are generated chess checkmate positions
(as result of software development, testing, etc., generator tool CM various versions, with source and binaries for windows/linux)

- only one first move solution
- count of pieces minimal for each puzzle case

1-move 82005 mate positions - M1 zipped pgn-file
2-move 49504 mate positions - M2 zipped pgn-file
3-move 23733 mate positions - M3 zipped pgn-file
4-move mate only 363 positions - M4 zipped pgn-file or brow-160

Added: feb.2022 a new CM4 searcher that finds puzzles like this. M4, moves

1..Be3, then Nd4, Rb6 to #... 

8/2pppp2/2r5/2pbk3/5p2/5P2/2Kbn3/8 b

As samples, M2, M3 checkmate puzzles