No.1488
Nicolas Dupont
(France)

Original Retro & PG problems
JF – R2019-20


Definitions: (click to show/hide)


No.1488 Nicolas Dupont
France

original – 21.03.2020

Solution: (click to show/hide)

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

PG 13.5                                   (16+16)
Leffie
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Geoff Foster
Geoff Foster
6 months ago

A fantastic problem! The path of the wBf1 is especially good. There are plenty of Leffie effects, as follows:
2.Ba6?? is illegal because bSb8 would observe wBa6.
The Back-home move 4.Sg1?? is illegal because wQd1 would observe bPh5.
9.Bb5?? is illegal because wBb5 would observe bRa4.

Nikola Predrag
Nikola Predrag
6 months ago

Moves like 2.Ba6?? are simply illegal. It’s not even trivial, it’s just the rules. It seems nonsensical to ask ‘why to choose a legal move instead of an illegal move’.
The point is in choosing AMONG THE LEGAL moves – ‘why this and not that LEGAL move’. A ‘Leffie effect’ makes sense when the illegality is the result of certain MOVE/PLAY, when the particular choice of moves creates such a ‘Leffie effect’.

The problem is fantastic because the intertwined conditions give birth to the new, transcendent features.

2.Bb5 c4 is a critical move & line-closure to prevent the ‘Back home’ 3.Bb5-f1
3.Se2 does the same (but anticipatory, to allow the line-opening 4…c3)
3…h5 pins wS, preventing ‘Back home’ Se2-g1
4.?? is the central point of the idea. White needs an ‘odd tempo’ to allow 4…c3 5.Bd3 (e.g. 4.Sa3? c3 5.Sb1). 4.f3? is ‘odd’ but unpins wS (4…c3 5.Sg1)
4.0-0 is the only good ‘odd’ choice at the moment but in the end it becomes ‘evened’ (4 moves altogether)
5…Rh6 6.Bh7 (critical&line-closure) enables 6…Ra6, which with 7…Ra4 determines (by departure) the timing of 8.Bd3 and the unique arrival 9.Ba6 (9.Bb5 is MADE illegal by the CHOSEN arrival of bR)
11.Rh1!(11.Ke1?/Sg1??) is the unique good choice among 3 ‘Back home’ moves (11.Ke1 leaves no time for ‘Back home’ by wB before 13…b5)

However, why that particular arrival 7…Ra4 is necessary, since 9.Ba6 is needed to prevent ‘Back home’ 9…Sb8 ?

dupont
dupont
6 months ago

Thanks friends for your elogious comments. Almost all thematic points have been listed. I played 6…Ra6 to get the opportunity to then play the important waiting move 7.f3 safely. Then 7…Ra5/a4/a3 are possible – I choosed square a4 just because a black rook should stand on a white colored square when possible (for a better visual effect).

Paul Raican
Paul Raican
5 months ago

This is another little jewel by Nicolas. By the way, he made a collection of such pgs (with Leffie condition) with the occasion of TT13 Quartz, recently judged by V. Crișan. See http://quartz.chessproblems.ca/pdf/49/Quartz49.pdf