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MatPlus.Net Forum Helpmates When castling must be the first move |
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| Page: [Previous] [Next] 1 2 | (21) Posted by Olaf Jenkner [Saturday, Jun 29, 2019 22:42] | Mirko Degenkolbe & Steven B. Dowd, 2010
(= 11+11 )
h#8,5 | | (22) Posted by James Malcom [Saturday, Jun 29, 2019 23:46] | Thanks for that view Olaf! | | (23) Posted by James Malcom [Friday, Jul 19, 2019 23:34]; edited by James Malcom [19-07-19] | I do note that the 8.5 is the record for which the ENDING move. But that sort of thing kind of HAS to be dual-free, so I'm not meddling with that.
Frank's h#7 is the record for a dual-free problem with castling as the first move.
It is possible to extend Frank's setup with this dual-heavy setup.
BTM, h#10
(= 9+9 )
This allows for a h#10. Feel free to find the solution, as I am not giving it away. It took me quite some time to find it myself.
Assuming that we always a WP on the g-file (to "lock in" the rook) blocked by a BP, I think that's it's impossible to achieve a h#11.
A WP g6 allows for a h#9 with a promotion
A WP g5, if you try promotion, there is a #11, but the #10 still exists, beating the 11.
A WP on g4 is the same story and g3 and g2 obviously don't work.
If you place the WP legally, it must be protected by other pawns and blocked in order to achieve a long mate.
If you try a WP f3, the only possible protected square, it ties for #10 with promotion involved.
But since that ties for the #11 without be those pawns, the f3 try can be killed off by the convention of trying to be economic.
So, all in all, as far as I can tell, my diagram for extending Frank's idea, with duals allowed, may be the best possible.
I even pulled up the e-file pawns up a step (from White's view) for fun, and I still found a h#10. A WP to fill in the e3 gap doesn't make a difference.
So I suppose that my diagram is the best of these two h#10 is the sense that it is much tougher to solve.
Can anyone can make good use of the now two
usable pawns with potential, one of each color, in my diagram? | | (24) Posted by Eric Huber [Friday, Jul 19, 2019 23:50] | I am not sure what can be done with the two additional pawns, but in this setting the helpmate in 10 is cooked in 7 moves.
For instance: 1.Bd1 Ra2 2.bxa2 b3 3.cxb3 c4 4.b2 c5 5.b1=R c6 6.Rb7 c7 7.Ra7 c8=Q#
There are also innumerable cooks in 8, 9 and 10 moves.
1.Ka7 Ra2 2.bxa2 b4 3.Kb6 b5 4.Kc5 b6 5.a1=B b7 6.Bxc3 b8=Q 7.Bd4 exd4+ 8.Kxd4 Qd6#
or
1.Ka7 Ra2 2.bxa2 b4 3.a1=B b5 4.Bxc3 b6+ 5.Ka6 b7 6.Bb4 b8=Q 7.Ka5 Qb7 8.Bd1/Bf1 axb4# | | (25) Posted by James Malcom [Saturday, Jul 20, 2019 00:30]; edited by James Malcom [19-07-20] | Eric, it is not cooked because it is White who mates, not Black. Sorry for not mentioning that!
EDIT: Nevermind! Sorry once more!
Man, it sucks that my diagram is cooked. The mating square that I originally had in mind for the BK was f3.
Additionally, any solution in 10 is not considered a cook, as per this one diagram, to me since I specifically mentioned that the point was to allow duals. | | (26) Posted by udo [Monday, Sep 21, 2020 08:41] | (= 12+9 )
U. Degener/M. Degenkolbe
The Problemist, 2020
h#10 (12+9)
1.Bg2 Bc1 2.Bf1 Bb2 3.Be2 Bc1 4.Bd1 Bb2
5.Bc2 Bc1 6.B×b1 Bb2 7.B×a2 0-0-0 8.B×c4 Rh1
9.B×d5 c4 10.Bf7 Rh8
length-record for h# with castling | | (27) Posted by James Malcom [Tuesday, Sep 22, 2020 05:01] | Thanks for the great news, udo! However, may you please also post it in this more relevant thread?: http://matplus.net/start.php?px=1600743591&app=forum&act=posts&fid=gen&tid=1413 | | (28) Posted by udo [Wednesday, Sep 23, 2020 10:38] | (= 7+9 )
U. Degener/M. Degenkolbe
10° Maroc Echecs, 2020
4° Recommande
h#8 (7+9)
1. e5 0-0-0 2. e4 Rd3 3. ed3 e4 4. de2 e5 5. e1B e6 6. Ba5 e7 7. Bd8 ed8S 8. a5 Sf7#
h#8 with castling at the first move
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MatPlus.Net Forum Helpmates When castling must be the first move |
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