Crazyhouse
Crazyhouse (also known as drop chess, mad chess, reinforcement chess, turnabout chess and schizo-chess) is a chess variant similar to bughouse chess, but with only two players. It effectively incorporates a rule from the game shogi, in which a player can introduce a captured piece back to the chessboard as their own.
Rules
All the rules and conventions of standard chess apply, with the addition of drops, as explained below.
- A captured piece reverses color and goes to the capturing player's reserve or pocket. At any time, instead of making a move with a piece on the board, a player can drop a piece from their reserve onto an empty square on the board. For example, a check that would result in checkmate in standard chess can be answered in Crazyhouse, if the defender can play a legal drop that blocks the check.[1]
- Drops resulting in immediate checkmate are permitted. Unlike in shogi, this includes pawn drops.[2]
- Pawns may not be dropped on the players' 1st or 8th ranks.[2]
- Promoted but captured pawns are dropped as pawns.[2]
Unlike shogi, having two or more pawns on a file, and checkmating with a dropped pawn, are both permissible.
Notation
An extension to the standard chess notation is used to record drops. Drops are notated by the piece type, followed by an @ symbol, then the destination square. For example, P@d5 means "pawn is dropped on d5 from reserve".[1]
FEN
There is no standard FEN specification for Crazyhouse. However at Lichess and Chess.com, extended version of FEN is in use. Here is Lichess's FEN implemention example.[3]
r2qk3/pp2bqR1/2p5/8/3Pn3/3BPpB1/PPPp1PPP/RK1R4/PNNNbpp b - - 89 45
Lichess simply adds a 0th rank as a reserve. There are more than 8 pieces on the reserve, so the last section may have more than 8 characters.
A different notation is used by Xboard/Winboard. The reserve is given in square brackets following the board position.
r2qk3/pp2bqR1/2p5/8/3Pn3/3BPpB1/PPPp1PPP/RK1R4[PNNNbpp] b - - 89 45
Competitions
Lichess World Crazyhouse Championship
Lichess CrazyHouse Championship 2017
1/8 Final
Each round consist of a match of 10 parties with 3 minutes per player.
1/8 Final | ||||
---|---|---|---|---|
1 | 9 | 6-0 | ||
2 | 10 | 5-7 | ||
3 | 11 | 6-3 | ||
4 | 12 | 6-1 | ||
5 | 13 | 7-5 | ||
6 | 14 | 6-3 | ||
7 | 15 | 6-4 | ||
8 | 17 | 9-1 |
the 8th Candidate
Format | Plce | |||
---|---|---|---|---|
Arena × 3 min | Lichess |
Tournament of the Candidates
Tournament of the Candidates[4] | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | |||
---|---|---|---|---|---|---|---|---|---|---|---|
1 | 6 | 44 | XXXXX | 1/2 5-5 | 1 6-4 | 1/2 5-5 | 1 6-4 | 1 8-2 | 1 6-4 | 1 8-2 | |
2 | 5 | 43 | 1/2 5-5 | XXXXX | 1 7-3 | 1/2 5-5 | 0 4-6 | 1 8-2 | 1 8-2 | 1 6-4 | |
3 | 4.5 | 40 | 0 4-6 | 0 3-7 | XXXXX | 1 8-2 | 1/2 5-5 | 1 6-4 | 1 6-4 | 1 8-2 | |
4 | 4 | 34 | 1/2 5-5 | 1/2 5-5 | 0 2-8 | XXXXX | 1 6-4 | 1/2 5-5 | 1 6-4 | 1/2 5-5 | |
5 | 3 | 32 | 0 4-6 | 1 6-4 | 1/2 5-5 | 0 4-6 | XXXXX | 0 1-9 | 1 7-3 | 1/2 5-5 | |
6 | 2.5 | 32 | 0 2-8 | 0 2-8 | 0 4-6 | 1/2 5-5 | 1 9-1 | XXXXX | 1/2 5-5 | 1/2 5-5 | |
7 | 1.5 | 28 | 0 4-6 | 0 2-8 | 0 4-6 | 0 4-6 | 0 3-7 | 1/2 5-5 | XXXXX | 1 6-4 | |
8 | 1.5 | 27 | 0 2-8 | 0 4-6 | 0 2-8 | 1/2 5-5 | 1/2 5-5 | 1/2 5-5 | 0 4-6 | XXXXX |
World Championship
Format | Place | World Championship | 1st Match | 2nd Match | 3rd Match | Total |
---|---|---|---|---|---|---|
3 match of 20 roundes × 3 min + 0 s | Lichess | 10 | 10 | 11.5 | 31.5 | |
10 | 10 | 8.5 | 28.5 |
Chess.com Championship
Chess.com Crazyhouse Championships 2016
Chess.com Crazyhouse Championships 2016[5] | |||||
---|---|---|---|---|---|
1 | 9 | ||||
10 | |||||
3 | 11 | ||||
4 | 12 | ||||
5 | 13 | ||||
6 | 14 | ||||
7 | 15 | ||||
8 | 16 |
Chess.com Crazyhouse Championships 2018
Chess.com Crazyhouse Championships 2018[6] | |||||
---|---|---|---|---|---|
1 | 9 | ||||
2 | 10 | ||||
3 | 11 | ||||
4 | 12 | ||||
5 | 13 | ||||
6 | 14 | ||||
7 | 15 | ||||
8 | 16 |
Variations
Minor variations of the rules have resulted in some variants.
See also
- Hostage Chess—a player can drop back into play their own previously captured pieces
References
- 1 2 "crazyhouse". FICS Help. Free Internet Chess Server. 2008-02-28. Archived from the original on 2014-04-16. Retrieved 2014-04-17.
- 1 2 3 "crazyhouse". ICC Help. Internet Chess Club. Archived from the original on 2012-05-02. Retrieved 2014-04-17.
- ↑ ""IM opperwezen vs LM JannLee in T6Q3tMva : Analysis board • lichess.org"". Lichess. Archived from the original on 2018-05-26. Retrieved 2018-05-26.
- ↑ tournament website.
- ↑ detail results
- ↑ Result
- ↑ "Game rules (Loop Chess)". BrainKing. Retrieved 2014-04-17.
- ↑ "Chessgi". ChessVariants.org. 2001-03-20. Archived from the original on 2014-03-27. Retrieved 2014-04-17.
External links
- Crazyhouse by Fergus Duniho, The Chess Variant Pages
- Scidb a chess database supporting Crazyhouse
- Rules for the variant on Lichess
- Blog post with introduction, theory and more resources