Puzzling Asked by Paul Panzer on April 29, 2021
Inspired by this puzzle: Doubled Knights redux
Let’s make the following change to the rules of chess. Every piece can once per game (on its day in the sun) make a double move.
Clarifications:
Things allowed in the double move:
Things not allowed:
Further clarifications:
Special rule:
A short example opening:
1.e4 (note how this pins both the d7 and f7 pawns) e5 2. Nc3 Bb4xc3 3. dxc3+ (because f8 is covered by the white queen and the black d-pawn is still pinned black can only defend by putting something in between:) Qe7-d6+ 4. Qxd6-a3 etc.
Your task: find the shortest possible game, i.e. the shortest sequence of legal moves from the standard opening position that ends in a mate or stalemate.
This seems pretty short:
The final move is a double check, so it cannot be blocked, and even with a double move, the king has nowhere to run.
EDIT: This is even quicker:
Now the black king has many squares it could reach, but the white queen is covering them all.
As a variation, black can also
Correct answer by Bass on April 29, 2021
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