MCC Chess Puzzles
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Nice puzzles!
These puzzles are dumb... they are all trick puzzles that have easy win like checkmate in 2 or 3, but the trick is that there is actually checkmate in 1... dumb.
The last puzzle is wrong as white has 2 alternative moves besides the intended solution to mate in 2 moves. The position should be mirrored to enable black to castle if white tries anything funny. And don't forget to tick the black castling box!
Not quite a mirror since black still can't castle. This one works though:
Don't know what you are trying to do. Your last diagram still has 3 solutions as black cannot castle. Ask StockFish!
Btw, if you insist on doing this without castling rights, you should add a black bishop on b4 in your diagram. But I bet there was a black castling right in the original publication of this puzzle. It's probably a golden oldie!
Another note of interest. I can see this is a professional puzzle composition for it displays a well-known 3-pronged device, the Valladao task. There is an e.p. move, there is castling and there is promotion distributed over several variations. No accident but the result of skilled puzzle design!