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4 votes
1 answer
193 views

The ultimate backgammon

The following position, where one player has borne off all their checkers while all of the other player's checkers are on the bar (thus losing a backgammon), is reachable by a legal sequence of dice ...
Parcly Taxel's user avatar
  • 8,685
8 votes
1 answer
261 views

Smallest number of moves to reach a "reverse checkers" position

A "reverse checkers" position is a position where every piece for one player is on one colour and every piece for the other player is on the other colour. Consider this position, for example:...
double-beep's user avatar
10 votes
2 answers
682 views

Advantage, Black!

In chess, the white player makes the first move. It is generally understood that this gives white a minor advantage, with a win rate of 52-56%. In this initial position, white actually has checkmate ...
Daniel Causebrook's user avatar
7 votes
2 answers
276 views

Retrograde Go Problem (Some Assembly Required)

An entry into the Fortnightly Topic Challenge #40. In case you aren't familiar with the rules of go, the information in the basic rules section of the Wikipedia page should be enough to solve this ...
Bass's user avatar
  • 80k
1 vote
1 answer
546 views

Stepladder Puzzle 2: Edge surfing

Continuing the Stepladder Game puzzle series, here's Stepladder Puzzle 2: Edge Surfing If you haven't played the Stepladder Game* before, you should first take a look at the rules, which can be ...
Bass's user avatar
  • 80k
4 votes
2 answers
228 views

Stepladder Puzzle 2: Edge Surfing (small target version)

Continuing the Stepladder Game puzzle series, here's Stepladder Puzzle 2: Edge Surfing (small target version) If you haven't played the Stepladder Game* before, you should first take a look at the ...
Bass's user avatar
  • 80k
13 votes
2 answers
642 views

Stepladder Game, Introduction and Puzzle 1: Turning

I want to introduce a new game to PSE: the Stepladder Game!* * You may already know this game by another name. The rules for the Stepladder Game: The game is played on a grid. Our grid is ...
Bass's user avatar
  • 80k