Fairy chess composition
 No.1235 Ladislav Salai jr., Emil Klemanič, Ladislav Packa (Slovakia) & Michal Dragoun (Czechia) Original Fairy problems JF – 2017(I): January – June

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 No.1235 Ladislav Salai jr., Emil Klemanič, Ladislav Packa, Michal Dragoun Slovakia/Slovakia/Slovakia/Czechia original – 30.06.2017 Solution: (click to show/hide) white Kb1 Qg7 Ra5 Rd6 Bg1 Sd5g6 pa2a3c2 RLb4 BLa6 BLe2 NLe7 black Kc4 pc3f2h5 RLc8 RLh1 BLf1 s#2                                            (14+7) Rook-Lion b4, c8, h1 Bishop-Lion a6, e2, f1 Nightrider-Lion e7 1.RLb4-h4 ! zugzwang. 1...f2*g1=Q 2.Sd5-b6 + 2...Qg1*b6 # {(2.Sdf4+? Qg4! 3.Rd1, 2.Sgf4+? Qd4! 3.Qg1)} 1...f2*g1=R 2.Sg6-f4 + 2...Rg1-g4 # {(2.Sb6X??, 2.Sdf4+? Rg4! 3.Rd1)} 1...f2*g1=B 2.Sd5-f4 + 2...Bg1-d4 # {(2.Sb6+?, 2.Sgf4+? Bd4! 3.Qg1)} 1...f2*g1=S 2.BLa6-d3 + 2...Sg1*e2 # 1...f2*g1=BL 2.Rd6-b6 2...BLg1-a7 # 1...f2*g1=NL 2.Qg7-e5 2...NLg1-d7 # { (C+ by Popeye 4.77)} Four different white answers to black AUW in SX2 can be realised in orthodox SX2 as well, but not with four black battery mates. Dynamic key, creating the three main variations (with promotions to Q, R, B), promotion to S in answered by antibattery check as well. (The zugzwang key avoiding moves of RLh1 from the first rank can be visually improved by adding a bPh6, but we refuted this possibility.) Last two variations use power of "antidual" white pieces in active way. (Authors)

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Thomas Maeder
July 3, 2017 19:29

1…fxg1=R 2.S*g*f4+ Rg4#
1…fxg1=B 2.S*d*f4+ Bd4#

shankar ram
July 4, 2017 14:11

The animation is working correctly. Only the notation is missing the departure squares. Needs correction of the underlying py2web script.

seetharaman
July 3, 2017 21:04

I think this task of 4 different answers to black AUW has not been done in orthodox S#2 many times. I know of only one such example.

shankar ram
July 4, 2017 14:14

It’s actually 6 different answers to a black super AUW (4 ortho plus 2 fairy promotions)

Michal Dragoun
July 4, 2017 21:44

Seetharaman: there are even several various mechanisms, mostly realized by Michal Caillaud, but the first invented already by G. Hume.
E.g. yacpdb Nos. 86603, 86608, 258735, 367766, 304362. Recently Y. Ueda published some such selfmates in Problem Paradise.

Georgy Evseev
July 5, 2017 08:13

Is there no better key?
Even Sf6-d5 looks more preferrable to me…

Georgy Evseev
July 5, 2017 08:17

No, I am wrong – RL promotion available in this case, but the question still stays.

Georgy Evseev
July 5, 2017 08:28

Ka1-b1 seems to work

Michal Dragoun
July 6, 2017 13:56

Yes, Ka1-b1 works. Definitely, the key 1.RLb4-h4 is not ideal, as takes Black four moves in zugzwang position. On the other hand, it brings more dynamic in play, as creates answer for three variations.

Georgy Evseev
July 6, 2017 20:17

In fact RLb4-h4 creates answer for 5 variations, while Ka1-b1 does it only for 4).

Michal Dragoun
July 6, 2017 22:20