view). "Check on the short diagonal". "Check by a knight". "Checkmate", "stalemate", "draw by repetition", "draw by insufficient force", "50-move draw". Pawn promotions are not announced. The precise location of the checking piece is not announced (although it may be deduced). To avoid wasting time with many illegal pawn capture attempts, players may ask the umpire "Are there any pawn captures?" or just "Any?" If there are no legal pawn captures, the umpire answers "No." Otherwise, the umpire answers "Try!" Asking "Any?" and receiving a positive answer obligates the asking player to then attempt a pawn capture: if this capture is unsuccessful, the asking player may then try any other move, pawn capture or not. En passant pawn tries are announced, but not the fact that they are en passant captures. Asking "Any?" when a player has no pawns left is treated as an illegal move and answered "Hell no" (or "Impossible", "Nonsense"). Illegal move attempts are not announced to the opponent. Kriegspiel problems Kriegspiel is sometimes used in chess problems. In these, usual variations introduced by different black moves are replaced by variations introduced by different announcements. An example of a Kriegspiel problem is shown. White must checkmate Black in 8 moves, no matter where the black bishop initially is (it is somewhere on dark squares) and no matter what Black plays. (In a real Kriegspiel game, Black would not see White's moves, but for a problem in which White is to force a win, one must assume the worst-case scenario in which Black guesses correctly on each move.) For example, 1.Ra1 is a draw by stalemate if the black bishop was initially on a1. 1.Nf2 Bxf2 2.Kxf2 (or Rxf2) is stalemate as well. So, White should not move either the knight or the bishop, because either might capture the black bishop by accident. For the same reason, the white rook should move only to light squares – but only half of the light squares are reachable without visiting a dark square along the way. Additionally, White should avoid placing his pieces on the a7–g1 diagonal prematurely because the invisible black bishop could be guarding that diagonal and capture the white pieces upon entering it, leading to a draw. The same applies to the e1–h4 diagonal. The solution is the following: White tries to play 1.Rg2. If this move is not possible (umpire says No), then the black bishop