The way I've done this in the past is to play a series of games with clocks starting with 10 minutes each on the clocks and then the rule for subsequent games that the winner of the previous game gets one minute less and the loser one minute more. This quickly stabilizes at a level where both players have good chances of winning.
Imagine a variation of chess without the rules about check and checkmate, where a player wins simply when he captures his opponent's king. In this variation, Kxd5 loses the game to exd5.
Turns out, that's more or less how real chess works. The objective is to capture the opponent's king. If your king is under attack, you must deal with that threat. If there'...
The Matt Bengtson problem Prof. Elkies mentions is:
[Title "Matt Bengtson, Chess Braintwisters (Burt Hochberg), no. 103. White to move & draw."]
[FEN "4kn2/3p1pPp/4pPpK/6P1/8/2p5/1b6/8 w - - 0 1"]
[Title "A Visual Solution Minus The Illegal Move"]
[FEN "4knq1/3p1p1p/4pPpK/6P1/8/2p5/1b6/8 b - - 0 1"]
1... Qg7+ 2. fxg7 c2 3. g8=Q c1=Q ...
The board and pieces
Quantum chess is played on a regular 8x8 chess board with standard pieces.
Pieces have rings around them, filled in with colour. These rings show the probability that the piece is in that square.
Modifications to existing chess rules
A player is not required to move their king out of check and the game concludes when there is a 100% ...
There is no mention of excluding the regular starting position in Appendix F. of the FIDE Laws of Chess, so it's really Chess960 and not Chess959. I can imagine that there are chess programs or websites which do exclude the regular starting position, but this is against the official rules.
Those are just the rules of the game. You could absolutely try to make the case that moving into check in such a situation should be legal, but playing by those rules wouldn't be chess anymore (it would be some variant).
You could also ask why stalemate is a draw and not a win, even though the latter result would make more sense in a real battle. These are ...
I will answer from a different perspective: why Racing Kings (RK) has a rule to allow black a chance to draw, and why the same logic doesn't apply to chess.
What is Racing Kings (RK)?
Background for those unfamiliar with RK: Both sides start with all pieces (no pawns), arranged on the first 2 ranks of the chessboard, white on the right, black on the left. ...
Well, it's a variant (since it's played by your friend and his sister, and probably at least some others), but not a well-known one. I used to think this idea would be only logical until I realized that a King moving into a square attacked by a pinned piece could still be captured by the pinned piece, and even though the opposing King would then be exposed ...
This post is in response to RemcoGerlich's request for a source for Annunuki's claim that the rule discussed here is an old rule.
From A History of Chess by H. J. R. Murray, chapter 5, "Chess in the Malay Lands", page 103:
"This leads to a still greater anomaly, a piece which is covering a check is deemed to have no power of giving check to the opposing ...
Andrew Bartmess was the first Star Trek fan to reverse-engineer the game of tridimensional chess from the TV series (which never explained the rules). He sells his version of the rules for $9.95: Tri-D Chess Rules.
In the most popular version of Tri-D chess (which Andrew calls the “The Federation Standard 5.0” rules), the game is played on seven boards, ...
I have found the trickiest part about playing 960 is the opening. So many possibilities! But, since the major pieces are random for every game it is unlikely you'll come across the same setup frequently enough to recognize some opening. So I say ditch trying to create one and stick with tried and true chess opening principles: Control the center, try not to ...
Castling is the only legal chess move in which two pieces are moved. You can verify this by searching for "FIDE Laws of Chess" and reading "Article 3: The moves of the pieces" (I do not provide the URL here because unfortunately it frequently changes).
From your description, I'm not sure whether in your childhood games the sort of double move you showed above could only happen at that one point in the game, or could continue to happen. So I don't have much to say, but there is at least an established chess variant (dating back to the early 20th century) in which your indicated sequence of moves could occur ...
No reason for Shizmoo's site closure in 2008 has been published online that I could find. There is a forum for former Kung Fu Chess enthusiasts here, but it's not particularly busy at the moment: http://www.zenchess.com/forum/
A few turnless/live chess variations inspired by Kung Fu Chess have sprung up, though, notably:
Ninja Chess for iPad
In my answer to the same question over on math.stackexchange, I discussed general m by n boards. Here I will just give a winning strategy for Player 2 on the ordinary 8 by 8 chessboard. It's based on the following pairing of squares:
a1c2, b1d2, c1a2, d1b2, e1g2, f1h2, g1e2, h1f2,
a3c4, b3d4, c3a4, d3b4, e3g4, f3h4, g3e4, h3f4,
a5c6, b5d6, c5a6, d5b6, e5g6, ...
I cannot really speak from my own experience, but there seems to be some very decent sites about Antichess.
Here is what this one has to say about the opening:
"Just like in chess, the main goal in the Losing Chess opening is development of the pieces. One has to be careful, as the starting position is quite volatile, and some first moves even lose ...
There is software for playing Tri-D Chess; Parmen is a Windows application written by Doug Keenan and available free on his website.
Here are some of the external links for (software) Raumschach and Tri-D chess:
There is a version ...
Douglas Crockford has written an accurate overview of Chinese Chess (or Xiangqi) from the perspective of a chess player. I quote the following:
Xiangqi can be played on a 9 by 10 uncheckered board. The board is
separated into two territories by a river running horizontally
through the center of the board. Bishops are unable to cross the
If you make a checkmating move before your flag falls, but then your flag falls before you press the clock, you win. The relevant FIDE rules (emphasis mine) are:
5.1.a. The game is won by the player who has checkmated his opponent’s king. This immediately ends the game, provided that the move producing the checkmate position was in accordance with Article ...
It's possible to use logistic regression (a statistical method) to estimate the predictive values. This way, you wouldn't need anyone to try the game at all.
http://www.sumsar.net/blog/2015/06/big-data-and-chess has the details. I personally tried the method, and it was a good start.
The method estimates the value of each piece by predicting how they ...
Wikipedia has a pretty complete listing of chess variants broken down by:
Chess with different starting positions
Chess with different forces
Chess with different boards
Chess with unusual rules
Chess with incomplete information or elements of chance
Single player variants
Chess with unusual (fairy) pieces
I found this on the web:
The rule that a pawn can not give checkmate probably stems from the rule that a piece may not be placed in a position from where it is unable to promote or continue. A pawn may only give checkmate by being placed directly in front of the emperor; a position from where it is unable to move or promote. It can not take the emperor ...
Unfortunately I don't know of a chess server where they play chess variants, (see update below) but I have a few other resources.
The program Winboard has several variants, including Shogi, Xiangqi, Shatranj and Atomic.
I also found a very cool blog, the guy there goes over a lot of chess and checker variants. Its pretty cool!
Here is a article he has ...
To answer the subquestion: "Does anyone know if this is some kind of known chess variant?"
Yes, it is a known chess variant. It goes under several names including PMDNC (Pinned Men Do Not Check), Pin chess, Superpin, or Stevens Principle. Its written history dates back at least to a publication by SJ Stevens in Westminster Papers in 1875.
I setup the position using this FEN String
4k3/pppppppp/8/8/8/8/PPPPPPPP/4K3 w - - 0 1
Using a grid engine cluster with 24 nodes, each node having 16 cores at 3.2 Ghz with 60gb of ram
The engine used was Houdini 4 pro (allowing multiple cores)
After analyzing for several days ( 4 days 12 hours 2 minutes and 15 seconds to be precise)
the engine scored the ...
A few ideas:
Michael Goeller's Pawn Battle which introduces a checkers-like game (that still follows the rules of chess) that wonderfully folds in key pawn concepts like break moves, sacrificing to clear a line and even zugzwang. This exercise also helps kids learn to appreciate calculating outcomes beyond just "Hope Chess"-ing it out.
Some of the handouts ...
Ralph Betza tried to do this and he wrote a series of six articles about this, starting with this one: http://www.chessvariants.com/piececlopedia.dir/ideal-and-practical-values.html
Ideas to determine the piece values include the following factors
average mobility (clearly the dominant factor, but hard to bring it down to numbers)
type of ...