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20 votes
Accepted

Could two kings force checkmate against a lone king?

If these are two real kings, it is not possible. This is because one requirement of checkmate is that the black king is in check which cannot be achieved with any of the white kings, since it would ...
user1583209's user avatar
  • 20.8k
18 votes

Could two kings force checkmate against a lone king?

A King and a Man (or commoner; i.e., a non-royal King) can mate a lone King. The longest distance to mate on a standard 8x8 board is 18 moves. The result quoted above was obtained by H.G. Muller in ...
Sir Cornflakes's user avatar
15 votes

Was there a chess piece—elephant, knight or rook—rendered as a being looking into two directions?

In shatranj, the game out of which chess developed, the rukhs (rooks) are portrayed a bit like the way you describe. That Wikipedia article contains this illustration of a 12th-century Iranian ...
Rosie F's user avatar
  • 6,315
13 votes
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How to solve this puzzle of Martin Gardner?

According to the FIDE Laws of Chess: 1.4 The objective of each player is to place the opponent’s king ‘under attack’ in such a way that the opponent has no legal move. 1.4.1 The player who achieves ...
Brian Towers's user avatar
  • 98k
10 votes

Was there a chess piece—elephant, knight or rook—rendered as a being looking into two directions?

The Janus-Springer set includes such a knight.
L. Scott Johnson's user avatar
9 votes

Controversy over the Xiangqi cannon piece?

The character 砲 (pào) gives a significant clue: compared to 炮, which is homophonous, the radicals of these characters are different. 砲 uses the 石 radical, which means stone, and 炮 uses the 火 radical,...
Andrew Chin's user avatar
8 votes
Accepted

Fairy chess: KNNvK

The Wikipedia page on the Nightrider contains an example from T. R. Dawson, published in the British Chess Magazine in 1925, where a king, knight and nightrider force a mate against a lone king. I ...
Glorfindel's user avatar
  • 24.9k
8 votes

Was there a chess piece—elephant, knight or rook—rendered as a being looking into two directions?

I don't really know the history; just was curious and will be presenting some of my google findings here. First, I came across Rook (chess) heraldry on Wikipedia: Chess rooks frequently occur as ...
anjama's user avatar
  • 181
5 votes

Would a piece that moved like a king – but could be captured (and could be moved en prise) – be considered a major or a minor piece?

This piece is widely used in different fairy chess variants. It appears under several names, including Commoner, Guard and Man / Mann. While the table in the Wikipedia article also linked to in @...
Glorfindel's user avatar
  • 24.9k
5 votes
Accepted

Would certain checkmates be possible if the king could move into check?

You could force a checkmate with two knights and a "king". Because the "king" does not fear being taken, it can move directly in front of the opponent's king, if it is protected by a knight. All it ...
D M's user avatar
  • 19.6k
5 votes
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Amazon vs Chancellor endgame

This is a great question and a fun problem to mull over. Indeed the way it's written on wikipedia one gets the impression that amazon-vs-empress fortresses are trivial and easily attainable for the ...
Ellie's user avatar
  • 12k
4 votes

How to solve this puzzle of Martin Gardner?

Ok, I think I got it. Your first move is Nc3-Nb5, threatening Nxc7 and Nxe8 in its next move, and since Black can't move their King they just can't prevent check mate. EDIT: just to make it clearer, ...
emdio's user avatar
  • 2,094
4 votes
Accepted

Material value of the Berolina pawn

According to Gnu, which has a page dedicated to Berolina chess, the value of the Berolina pawn is the same as in standard chess, = 1. This is unsatisfactory because they give no explanation of how ...
Brian Towers's user avatar
  • 98k
4 votes

Would a piece that moved like a king – but could be captured (and could be moved en prise) – be considered a major or a minor piece?

I haven't heard of that definition being used for a major piece, but it's a neat observation. Such a piece (call it X) should be able to force a checkmate in a K+X vs K situation. Say White's pieces ...
Inertial Ignorance's user avatar
4 votes
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Chess variants-Anyone recall the name for one that has a "superpiece" with the movements of the queen and knight?

According to the Wikipedia variants page, there does not seem to be a variant with a specific name, but there are several variants that use the queen-knight hybrid, which is called an Amazon (...
PhishMaster's user avatar
  • 32.6k
4 votes

Could two kings force checkmate against a lone king?

Non-royal king is a combination of [0,1] leaper (wazir) and [1,1] leaper (fers) and in fairy chess called a erlking. About erlking, see my book Fairy chess endings on an n x n chessboard (2017), page ...
Vaclav Kotesovec's user avatar
4 votes

Is this a sound elephant offer?

It's not a sacrifice, it's a trade after 1. Gxc2 G*b3 and taking the elephant on a3 next. On the other hand, since doubutsu shogi is strongly solved, you can use an engine/tablebase (e.g. https://...
Remellion's user avatar
  • 5,040
4 votes
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Fairy endgame statistics for KDDDDvKN (D=dabbaba; '2,0' leaper)?

I was unable to generate data for exactly what you want, but I managed something with a restriction to 6x6 board. I think it's reasonable to assume that it doesn't make a big difference from 8x8 for ...
Sopel's user avatar
  • 268
4 votes
Accepted

What is the maximum number of squares 8 queens and 8 nightriders can attack on a 16x16 board?

It's possible to attack all squares. Q - queen N - nightrider Yellow background - attacked only by a queen Red background - attacked only by a nightrider Orange background - attacked by pieces of ...
Sopel's user avatar
  • 268
3 votes

Would a piece that moved like a king – but could be captured (and could be moved en prise) – be considered a major or a minor piece?

That is an interesting distinction theory. Although this king-like piece could deliver checkmate with the help of the king, I've always considered the difference to be based on the value of the piece....
Mike Jones's user avatar
  • 5,169
3 votes

Would a piece that moved like a king – but could be captured (and could be moved en prise) – be considered a major or a minor piece?

The king is worth about 4 pawns if its loss didn't lose the game, which means it's neither a minor or a major piece, but something in between. (Major pieces like the rook is worth 5+ pawns; minor ...
Allure's user avatar
  • 27.7k
3 votes
Accepted

Marshall vs. Queen Endgame

Since my Stockfish fork for fairy chess variants already supports Almost Chess, I added Sort of Almost Chess with both sides having all promotion options (which is what you seem to imply in your ...
Fabian Fichter's user avatar
3 votes

Do amphibians usually have more synergy than other compound pieces?

Not just amphibians. Other pieces too! Note: I'm assuming an 8x8 board. A different board size would have VERY different values! Let's take the queen as a standard. Queen consists of Rook + Bishop, ...
Feliks_WR's user avatar
2 votes

Fairy chess: KNNvK

See my book Fairy chess endings on an n x n chessboard (2017), p. 345 and 414. The ending of king + two nightriders against bare king on board 8x8 is won for the stronger side and the longest win has ...
Vaclav Kotesovec's user avatar
2 votes

What is the maximum number of squares 8 queens and 8 nightriders can attack on a 16x16 board?

This is my best attempt thus far, which I believe attacks 236 (all but 20) squares. I used the staircase solution for 8 queens on the central 8x8 region in order to consequentially fully cover the 4 ...
RadiantDarkBlaze's user avatar
2 votes
Accepted

Is it possible for the hopper/locust to jump over unmovable squares?

Your question: If a board with unmovable squares, such as Chessence, has a Cannon on a1, and an enemy piece on a3, can the Cannon jump over the unmovable square (a2) and capture the target? Relevant ...
hkBst's user avatar
  • 1,664
2 votes

Given the value of a given piece is there a way to find the value of a similar piece that can only move, without capturing, or only capture?

Fairy-stockfish can help you with this. You can define pieces you described. To find the optimal piece values, depends on your starting position and board size. Create some start positions, do some ...
ferdy's user avatar
  • 4,015
1 vote

Is it possible to put special pieces on a chess.com custom board?

Probably the most advanced diagram creator in the whole Internet is the Board Painter of Musketeer Chess. There are others, but none like this. It has almost FOUR HUNDRED different fairy pieces for ...
cssdixieland's user avatar
1 vote

An online dictionary of fairy chess pieces indexed by move

There is the Wikipadia page "Fairy Chess Piece" with a table of popular and well known fairies. You can re-order the table by Betza notation or Parlett notation to get an ordering by move ...
Sir Cornflakes's user avatar

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