Chess Construction Challenge #2-Check!

Question

It’s time for round two!

Given that:

Construct:

A legal position in which both sides help to give a legal sequence of 13 mutual checks

Position variations are allowed. To my knowledge, there is really only one way in which this idea can be constructed. I accept alternate answers.

If you have questions, feel free to ask in the comments section below!

Good luck!

Community · Accepted Answer · 2020-06-17 08:22:35Z

12

My position has a fourteenth check too, but that's probably ok. :-)

[FEN "8/8/8/8/8/4K3/2pppppp/RR4Nk w - -"]

These are the moves:

 1. Nh3+  d1=N+
 2. Rxd1+ cxd1=N+
 3. Rxd1+ e1=R+
 4. Rxe1+ f1=N+
 5. Rxf1+ g1=B+
 6. Rxg1+ hxg1=B+
 7. Nf2+  Bxf2+

And here's the whole solution uploaded to Lichess.

EDIT: Looks like 15 is also doable:

The final check feels like such a waste of a piece though; the first fourteen checks are possible with white having only two pieces and a king:

[FEN "8/8/6Q1/8/5R2/5p2/ppp1p1p1/R3K1k1 w - -"]

 1. Qb6+   f2+
 2. Kd2+   b1=N+
 3. Qxb1+  axb1=N+
 4. Rxb1+  c1=B+
 5. Rxc1+  e1=B+
 6. Rxe1+  f1=N+
 7. Rexf1+ gxf1=N+
 8. Rxf1+

Again, here's the Lichess link.

CommunityBot

1

answered Jul 14, 2019 at 21:26

Bass

75.8k7 gold badges172 silver badges352 bronze badges

$\begingroup$ Incredible! Thank goodness I checked back. I was wasting so much time not considering promotions! Would love to know your thought process? Had you just seen this kind of pattern before? $\endgroup$
– Parseltongue
Jul 14, 2019 at 21:35
$\begingroup$ nice. I think you could substitute queens for one or both of the rooks, too. $\endgroup$
– SteveV
Jul 14, 2019 at 21:40
$\begingroup$ Well, there seemed to be very few options for b to give check, so it seemed obvious that at least some of black's checks had to be promotions. -> maybe they could all be? I then managed to find a couple of ways to do just that, and one of them had an extra check at the end. $\endgroup$
– Bass
Jul 14, 2019 at 21:40
$\begingroup$ Nice job on finding one more than I thought was possible @Bass! Here's my setup for 13 mutual checks. I'm sure that you can figure out the moves! ;D: 7Q/8/8/8/8/1R3R2/pppKppp1/k7 w - - 0 1 $\endgroup$
– Rewan Demontay
Jul 14, 2019 at 21:48
2

$\begingroup$ @RewanDemontay TWO more :-) $\endgroup$
– Bass
Jul 14, 2019 at 22:20

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