I don't understand the logic, if there is one at all. 11.5 is AS EXACT a number as it could…
Good choice, Nicolas. Although there are exceptions to this rule, it is a well established convention that a PG is…
Is is true that, in the modern approach, PG is often used to denote in fact SPG, and exact PG…
Joost, the stipulation "Shortest Proof Game" does not need to specify the side to move, or the number of moves…
That is the point Georgy. For threefold repetition of position to be claimed by players the side to move is…
IMO, SPG 11.5 asks for the shortest proofgame with black to move, and since there's no proofgame in less moves…
Thierry Le Gleuher told me that as the retros editor of Phénix he would consider a PG 11.5 cooked if…
Although the main idea of this problem is to lose a tempo for a PG 11.5, any shorter solution, whether…
A nice idea. Promotion must be to queen, because a knight cannot lose a tempo.
PG 11.5 cannot be cooked in 11 moves because the side to move will be different. Shorter solution (cook) can…