The puzzle data files used on https://blitztactics.com
- 125,262 lichess v1 puzzles
- speedruns and countdowns are generated from a subset of these
- 150 repetition levels, 2912 puzzles
- around 20 puzzles each level
- 28,649 haste puzzles, same puzzles as 'three'
- 18,308 rated puzzles
- 4 infinity puzzle difficulties
- easy - 8,960 puzzles
- medium - 8,219 puzzles
- hard - 6,652 puzzles
- insane - 4,533 puzzles
This is the data structure of each JSON file in lichess-puzzles-v1:
{
"puzzle_data": {
"initial_fen": "5r2/5pk1/2p3pp/1p2q3/3rN3/PB2R3/1P4PP/4Q2K b - - 5 36",
"initial_move_san": "Re8",
"initial_move_uci": "f8e8",
"puzzle_fen": "4r3/5pk1/2p3pp/1p2q3/3rN3/PB2R3/1P4PP/4Q2K w - - 6 37",
"lines": {
"e4d6": {
"e5d6": {
"e3e8": {
"d4d3": "win"
}
}
}
}
},
"metadata": {
"id": 125262,
"rating": 2280,
"enabled": true,
"color": "white",
"game_id": "e2m7WGOU",
"attempts": 375,
"vote": 4
}
}
The new lichess puzzles have not been added yet. This is a work in progress.
Each JSON file in game-modes contains an array of puzzles with this structure:
{
"id": 51073,
"fen": "1Q6/8/8/8/8/2K5/k7/8 b - - 13 62",
"lines": {
"b8a7": "win",
"b8a8": "win",
"b8b3": "win"
},
"initialMove": {
"san": "Ka3",
"uci": "a2a3"
}
}