Lion(LI): Moves along Queen lines over another unit of either color to any square beyond that unit. A capture may be made on arrival, but the hurdle is not affected.
Bishop-Lion(BL): (1,1) Lion. Moves along Bishop lines over another unit of either color to any square beyond that unit. A capture may be made on arrival, but the hurdle is not affected.
Rook-Lion(RL): (0,1) Lion. Moves along Rook lines over another unit of either color to any square beyond that unit. A capture may be made on arrival, but the hurdle is not affected.
Nightrider-Lion(NL): (1,2) Lion. Moves along Nightrider lines (Nightrider(N): (1,2) Rider. Operates along straight lines with squares lying a Knight’s move away from each other) over another unit of either color to any square beyond that unit. A capture may be made on arrival, but the hurdle is not affected.
No.1235Ladislav Salai jr.,
Emil Klemanič, Ladislav Packa,
Michal Dragoun Slovakia/Slovakia/Slovakia/Czechia original – 30.06.2017
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)
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.
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.
Geoff Foster Aug 12, 7:46 on No.1316 (GG&ND) { This subject was discussed on the MatPlus forum back in 2012: http://www.matplus.net/start.php?px=1534048897&app=forum&act=posts&fid=gen&tid=1139&pid=8975&mark=yes&#n8975 }
Nikola Predrag Aug 11, 23:00 on No.1316 (GG&ND) { Different genres have different principles and meaning of the features. And the outcome of a... }
Vlaicu Crisan Aug 11, 13:30 on No.1316 (GG&ND) { The example no 8 from the aforementioned book "Shortest Proof Games" by Michel Caillaud &... }
Geoff Foster Aug 11, 13:22 on No.1315 (RB&SL) { A very nice problem. The difficult thing for composers is avoiding promotions to other pieces.... }
1…fxg1=R 2.S*g*f4+ Rg4#
1…fxg1=B 2.S*d*f4+ Bd4#
The animation is working correctly. Only the notation is missing the departure squares. Needs correction of the underlying py2web script.
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.
It’s actually 6 different answers to a black super AUW (4 ortho plus 2 fairy promotions)
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.
Is there no better key?
Even Sf6-d5 looks more preferrable to me…
No, I am wrong – RL promotion available in this case, but the question still stays.
Ka1-b1 seems to work
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.
In fact RLb4-h4 creates answer for 5 variations, while Ka1-b1 does it only for 4).
Yes, you are right, I didn’t notice immediately, how much white pieces is able to move on b1…