No.1310
Ya’aqov Mintz (Israel)

Original Retro & PG problems
JF – R2017-18


No.1310 Ya’aqov Mintz
Israel

original – 09.07.2018

Solution: (click to show/hide)

white Bf1c1 Ke1 Qd1 Ph2g2f2e2d2c2b2a2 Sg1b1 Rh1a1 black Bf8c8 Ke8 Qd8 Ph7g7f7e7d7c7b7a7 Sg8b8 Rh8a8

PG 10                                        (13+9)


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Thomas Maeder
Thomas Maeder
July 10, 2018 21:00

> What might be the reason?

The reason is that Popeye only tests for checkmate when it is told to, most often to test find out whether the mate goal requested by the stipulation is reached.

Testing for mate in proof games would be a waste of time.

Joost
Joost
July 11, 2018 12:12
Reply to  Thomas Maeder

You’d only need to do the check when displaying the solution, don’t you?

Paul Raican
Paul Raican
July 11, 2018 07:29

Jacobi+ (with checkmate on the last move).

Nikola Predrag
Nikola Predrag
July 11, 2018 15:39

Sometimes it’s crucial to know the full effect of a move. The legality of play might depend on ‘which side is in check’.

For instance, https://juliasfairies.com/problems/page-19/#No.50
The LEGAL solution of b) should start with 1.Kg5+!!!

Or a simpler position which could be legal if the side having the move is in check:
White Kc5 Be3
Black Be7 Kg5
Condition TransmutedKings Lortap