Author Topic: Peace Chess (Paco Shako)  (Read 101 times)

HGMuller

  • Global Moderator
  • Full Member
  • *****
  • Posts: 122
    • View Profile
Re: Peace Chess (Paco Shako)
« on: February 04, 2018, 05:17:38 pm »
That is a useful strategic insight, about the Knight. I would like to build an AI that can play this, in oder to test rule variations (e.g. how they affect draw rate). But it is very hard to make an evaluation function; I simply don't know what one should strive for when embracing the opponent King is not within the horizon.

As to your questions:
A) The rule book that is delivered with the pieces describes e.p. capture as moving back the 'captured' Pawn one square to embrace it, and then move the now released piece from the square it was. This strikes me as illogical, as there isn't any need to move the released piece. A more logical way would move back the entire pair to the square it skipped, and then perform the capture as normal. It probably wouldn't affect the game much whether you do one or the other.
B) Pawns reaching last rank promote, even if the opponent dragged them there. The most practical way to do this in a timed game is to just press the clock after you dragged the Pawn, so the opponent can (and must) decide what to replace it with in its own time, in additio to playing his normal move.
Note that Pawns can also be dragged to first rank. They will have a double-push from there, which would be subject to e.p. capture.
C) Indeed, Kings should not travel through squares that are under real attack (by a lone piece, or through a chain move).
D) It doesn't matter whether the Rook is paired (although it might not be a good idea to put your King next to a pair).
E) Indeed, only diagonal Pawn moves can embrace (possibly triggering a release). Moving straight forward is only possible to empty squares. So an embracing Pawn can very easily be blocked, and can then neither be released, nor move the entire pair. It is forbidden to move into an embrace when the released piece would not have a place to go.