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11 problem(s) found in 6263 milliseconds (displaying 11 problem(s)). [COMMENTDATE>=20200919 AND NOT K='Hilfsrückzüger' AND NOT A='Tschornous, Wolodymyr M.' AND K='Bosma'] [download as LaTeX]

1 - P1377133
Robert Norman
Jens Kristiansen

Far off Chess 13/12/2008
RN, Version JK
P1377133
(3+6) C+
#4
1. Kf7! droht 2. Txh5#
1. ... Sd6+,Sd8+ 2. g7+ Kh7 3. g8=D+ Kh6 4. Dg7#
play all play one stop play next play all
A beautiful version of P1377131

http://faroffchess.blogspot.com/2008/12/in-twilight-zone-of-chess-rules.html

"Ok, you may say that this is all old stuff, very entertaining but with no relevance for nowadays chess. So? Well, look at this endgame study which circulated among the chess insiders in the 80s:

White to move and win - my version (from memory)

I believe I have read somewhere that the composer is from Dar-Es-Salaam, but I can not find sources for that.

The solution is: 1. Kf7, Nd6+ 2. g7+!, Kh7 3. g8D+ and mate next move.

Then you may object that white is in check, in fact a double check, when he unaffectedly moves his little pawn at the second move. Yes, he is in check BEFORE the move, but is he after? You see, at that time the rules stated that the king is in check "...when the square it occupies is threatened by one or TWO of the opponents pieces." So the check is elegantly parried by making the kings square threatened by THREE pieces!

Relax, nowadays the rules state that the square in question must be threatened by "... if one or more of the opponents pieces."
James Malcom: What is the Winchloe solution then, even with duals? Of course, as an endgame study, it is still correct. (2020-11-13)
A.Buchanan: As a #4, WinChloe gives: 1.Rf7! [2.T×h5‡]
1…Cd8+ 2.g7+ Rh7 3.g8=D+ Rh6 4.Dg7‡
1…Cd6+ 2.g7+ Rh7 3.g8=D+ Rh6 4.Dg7‡
Switchback blanc
Switchback de Pion
Echecs croisés
Guidelli
Echec double
Batterie noire
Auto-clouage indirect
Déclouage indirect
Promotion
Clé désampliative (2020-11-26)
more ...
comment
Keywords: Golden Age, Joke, Bosma, Promotion (D)
Genre: n#, Fairies
Computer test: C+ WinChloe v3.51
FEN: 7k/rn6/5KP1/p1p4b/8/8/8/7R
Input: James Malcom, 2020-06-20
Last update: A.Buchanan, 2024-02-01 more...
2 - P1381285
Andrew Buchanan
James Malcom

MatPlus.net Forum 25/10/2020
P1381285
(5+7) C+
#3
Bosma
1. Tf5+! Sxf5+ 2. Se4+! Sxe4 3. De6#
play all play one stop play next play all
James Malcom: I've added in the solution now. (2020-11-02)
Henrik Juel: Thanks, James
I cannot test the problem, but it seems OK (2020-11-02)
A.Buchanan: Thanks Henrik: it's C+ according to WinChloe (2020-11-03)
comment
Keywords: Aristocrat, Bosma
Genre: 3#, Fairies
Computer test: C+ WinChloe v3.51
FEN: 3r2R1/3Q4/3K1k2/2n1R3/1b6/6n1/3N3q/3r4
Input: A.Buchanan, 2020-10-25
Last update: A.Buchanan, 2020-11-03 more...
3 - P1381497
James Malcom
chess.stackexchange.com 15/6/2020
P1381497
(3+4) C+
#1
Bosma
1. 0-0#!
play all play one stop play next play all
https://chess.stackexchange.com/a/29992/15543
A.Buchanan: Hi James, couple of nits about old Bosma:
(1) From the 1985 Laws: "Article 5. THE MOVES OF THE PIECES The King (a) Except when cast[l]ing, the king moves to any adjoining square that is not attacked by an opponent's piece." This is separate from Article 9. CHECK 9.1 "The king is In check when the square it occupies is attacked by one or two of the opponent's pieces; in this case the latter is or are said to be "checking the king.' 9.2 Check must be parried by the [move] immediately following." This point may have been an assumption in earlier compositions, as e.g. it prevents kings from being adjacent.
(2) And again from Article 5. "(f) Castling is prevented for the time being - (i) if the king's original square or the square which the king must cross over or that which it is to occupy is attacked by an opponent's piece," Does this prevent your 1.0-0?
What do you think? (2020-11-08)
James Malcom: Ah, why did I but never bother to look at the castling rules!

Well I see nothing against adjacent kings, and seeing about how the "loophole" was about was not explicitly stated couldn't be done, I see it as allowed, and thus what to watch out for in cooks.

The rule on castling says "piece," not pieces. So, quite simply, castling in, out (P1381498), and through (P1381499) check is allowed in my view. (2020-11-09)
James Malcom: Furthermore, if a king is "attacked," they are in check, plain and simple. So, since a triple check/ attack is not defined as a danger to the king, the king may go to any such square, including the acts of catling and adjacent kings.

Also, going by the law itself, and not the Bosma conditions, the king may be captured, but it does nothing and that side can never be checkmated, while Bosma Chess itself allows no king capture. But since the effect is the same, allowing for my jokes to be C+ by Winchloe if the program agrees. Maybe try out my castlings in it? (2020-11-09)
James Malcom: And indeed Andrew has tested my castling problems now-all are C+? (2020-11-14)
James Malcom: Typo-!, not ?. (2020-11-14)
more ...
comment
Keywords: Joke, Bosma, Miniature, Castling as mating move
Genre: n#, Fairies
Computer test: C+ WinChloe 3.51
FEN: 8/8/8/8/8/7n/5Rrp/2k1K2R
Input: James Malcom, 2020-11-03
Last update: A.Buchanan, 2024-02-01 more...
4 - P1381499
James Malcom
chess.stackexchange.com 12/8/2020
P1381499
(6+5) C+
#2
Bosma
1. 0-0+!
1. ... Shxf1 2. Dg4#
1. ... Sgxf1 2. Df2#
1. ... Lxf1 2. Tf2#
play all play one stop play next play all
https://chess.stackexchange.com/a/29992/15543
A.Buchanan: Nice way to combine an orthodox theme with Bosma castling (2020-11-13)
James Malcom: Thanks, Andrew. Castling with check is the easiest way to achieve it of course, not to mention the flight taking. I'll try out a version without check, here soon. (2020-11-13)
comment
Keywords: Joke, Bosma, Castling key, Checking key, x pieces capture on one square, Flight taking
Genre: 2#, Fairies
Computer test: C+ WinChloe 3.51
FEN: 8/8/8/5B2/5p1Q/5kn1/2NRb2n/4K2R
Input: James Malcom, 2020-11-03
Last update: A.Buchanan, 2024-02-01 more...
5 - P1381500
James Malcom
English Chess Forum (Website) 13/6/2020
P1381500
(3+4) C+
#1
Bosma
1. Kc2#!
play all play one stop play next play all
https://www.ecforum.org.uk/viewtopic.php?p=246809#p246809

Reprint: https://chess.stackexchange.com/a/29992/15543
James Malcom: The wSe1 prevents the orthodox cook of 1. ... Kxc2. (2020-11-14)
comment
Keywords: Joke, Bosma, Miniature
Genre: n#, Fairies
Computer test: C+ WinChloe 3.51
FEN: 8/8/8/8/8/3p4/3rp3/RK1kN3
Reprints: chess.stackexchange.com 13/6/2020
Input: James Malcom, 2020-11-03
Last update: A.Buchanan, 2024-02-01 more...
6 - P1381502
James Malcom
chess.stackexchange.com 13/6/2020
P1381502
(6+1) C+
#1
Bosma
1. Se5#!
play all play one stop play next play all
A.Buchanan: Trivial verification, perhaps, but at least it confirms that WinChloe's understanding of the condition resembles James'. (2020-11-13)
comment
Keywords: Joke, Bosma, Miniature, Flight taking, Rex solus (s)
Genre: n#, Fairies
Computer test: C+ WinChloe 3.51
FEN: 8/7B/3B2NK/8/5k2/6P1/5Q2/8
Input: James Malcom, 2020-11-03
Last update: A.Buchanan, 2024-02-01 more...
7 - P1381880
Nikolay A. Zharkov
Probleemblad 1993
1. Preis h#
151. Thematurnier
P1381880
(5+4) C+
h#2
Bosma
b) wBd4->e3
c) ferner wBd3->e4
a) 1. Dc5 d5 2. e1=T Kg1#
b) 1. Dxd3 e4 2. e1=L Kg3#
c) 1. Dd5 e5 2. e1=S Kg2#
play all play one stop play next play all
Preisrichter: "In a very subtle way three minor promotions emerge which appeal to me very much. Personally, I have a soft spot for problems like this."
A.Buchanan: Are Nikolai Sharkow & Nikolai A. Sharkow the same person? The areas of interest seem sufficiently distinct that I didn't want to merge PDB composer IDs without confirmation. (2020-11-14)
Henrik Juel: I expect that NS and NAS are identical, but who knows?
What are the solutions?
I see a Bosma mate with Df5 on, say, c2, e1=S, and Kh2 on g2, but I cannot get there (2020-11-14)
A.Buchanan: Really rather nice twinning. WinChloe thinks these are the same guy, so I'll go with that. (2020-11-14)
Henrik Juel: Certainly a worthy prize winner (2020-11-14)
comment
Keywords: Bosma, under-promotion (t,l,s), Capture key
Genre: h#, Fairies
Computer test: C+ WinChloe 3.51
FEN: 4N1rk/8/8/5q2/3P4/3P4/4p2K/7R
Input: A.Buchanan, 2020-11-14
Last update: A.Buchanan, 2020-11-18 more...
8 - P1381885
Frank Christiaans
Probleemblad 1993
1. Lob #2
151. Thematurnier
P1381885
(5+2) C+
#2
Bosma
1. Se7! zz
1. ... Lh5,Le8 2. Tg8#
1. ... Kg8,La2,Lb3,Lc4,Ld5,Le6 2. Seg6#
1. ... Lg6 2. Tg8,Sexg6#
1. ... Lg8 2. Txg8,Seg6,Sfg6#
play all play one stop play next play all
Henrik Juel: Popeye says 1.Se7 and 1.Sh6
How does the Bosma condition change this?
The intention is probably 1.Sh6, as 1.Se7 entails far more duals (2020-11-14)
A.Buchanan: 1. Sh6? fails to 1. Kg8,La2,...,Le6 as can't unoverload g8. 1.Se7! has duals after Lg6 & Lg8. This isn't great but in better shape than many of the others (2020-11-14)
Henrik Juel: Thanks, Andrew
The weird condition is trickier than I thought (2020-11-14)
A.Buchanan: Haha yes Henrik: they are hard to debug: because it's always unclear whether a piece, of either colour, is helping or hurting :) (2020-11-14)
comment
Keywords: Bosma, Aristocrat
Genre: 2#, Fairies
Computer test: C+ WinChloe 3.51
FEN: 5NNk/5bRB/5K2/8/8/8/8/8
Input: A.Buchanan, 2020-11-14
Last update: A.Buchanan, 2020-11-18 more...
9 - P1381888
Ion Murarasu
Probleemblad 1993
2. Preis #2
151. Thematurnier
P1381888
(14+10) cooked
#2
Bosma
1. Tc3! zz
1. ... Txf4 2. Tc5#
1. ... Tg4 2. Sc7#
1. ... Txh3 2. Sc7#
1. ... Lxf3 2. Sf6#
1. ... Lg4 2. Sc7#
1. ... dxc3 2. Td1#
1. ... d3 2. Txd3#
1. ... Txb3 2. Le6#
1. ... Dxb4 2. Te5#
1. ... Dxb3 2. Le6#
1. ... Dxb5 2. Se7#
1. ... axb4 2. Te5#
play all play one stop play next play all
Cook: 1. Td1! droht 2. Sf6,Sc7,Tc5#
1. ... d3 2. Txd3#

1. Td2! droht 2. Le6,Se7,Te5#
1. ... d3 2. Txd3#
Preisrichter: "An impressive problem and a multitude of variants. The therefore also somewhat heavy position and the one dual 1 ... Kc5 or Ke5 is forgiven. A problem to play."

Correction at P1381912
A.Buchanan: This is a delightful problem, but cooked in the original. However it can be smoothly corrected by shifting wTc2 to c7 (and I don't see any other ways to do it). Alas the composer is no longer with us. (2020-11-14)
comment
Keywords: Bosma, Superseded by (P1381912)
Genre: 2#, Fairies
Computer test: C- WinChloe 3.51
FEN: 2NQN3/8/1P1p2p1/pP1k2Pb/qP1p1P1r/rP3P1B/p1R5/K3R3
Input: A.Buchanan, 2020-11-14
Last update: A.Buchanan, 2020-11-18 more...
10 - P1381901
Dolf Wissmann
Probleemblad 1994
P1381901
(10+14) cooked
#3
Bosma
1. Db8! droht 2. S2c4+ Lxc4 3. Kd5#
2. ... Kxd6 3. Se5#
1. ... Lxd2 2. Sf7+ f4 3. Sd6#
2. ... c2 3. Sg5#
2. ... Kd6 3. Se5#
1. ... Txd2 2. Sc4+ f4 3. Sb2#
2. ... c2 3. Sd6#
2. ... Kd6 3. Se5#
play all play one stop play next play all
Cook: 1. Sxb5+!
1. ... Txc7 2. Sd6 droht 3. S2c4,Sf7,S6c4#
2. Sd4 droht 3. Txe6,Sc4#
1. ... Kd6 2. Kc4+ e5 3. Dxc8#

1. Dc6! droht 2. Sf3+ exf3 3. De4#
2. Dd5+ exd5 3. Txf5#
2. Dxb5 droht 3. S2c4,Sf7,S6c4# Sc7+ 3. Kd5#
A.Buchanan: Replacing sTc8 with sD eliminates one cook and simplifies the other, but 1. Sxb5+! Kd6 2. Kc4+ e5 3. Dxc8# remains. The intended solution is beautiful and ambitious - I suspect it must have been cooked before the prizes were awarded, otherwise to me it would be prize material. (2020-11-14)
A.Buchanan: Alternatively, shifting wD to b8 and wTg6 to g4 fixes everything, at the cost of a flight-taking key. On the other hand in Bosma every piece comes with a downside, and Black can use wTg6 as a defence, always threatening e6-e5 when bK has shifted to d6. This to some extent compensates for the crudeness of the key. This is an amazing problem and if it has been sound at the time, I would have given it first prize (2020-11-15)
comment
Keywords: Bosma
Genre: 3#, Fairies
Computer test: C- WinChloe 3.51
FEN: 2r5/1PQnp3/np1Np1Rb/1bK1kp1R/1p2p3/2pB2P1/r2N4/B7
Input: A.Buchanan, 2020-11-14
Last update: A.Buchanan, 2020-11-16 more...
11 - P1382079
Johann Christoffel van Gool
Henk le Grand

Probleemblad 1993
1. Lob h#
151. Thematurnier
P1382079
(4+10)
h#3
shy Bosma
1. Td3 Ke3 Dc3 Kd4 Tg4 e5#
play all play one stop play next play all
The current WinChloe results are consistent with this problem being sound under shy Bosma: hurray!
Preisrichter: "This problem is very interesting, but it only has one solution. But it is funny to see that the white king of all pieces which closes the black queen line to e5!"
more ...
comment
Keywords: Bosma (shy)
Genre: h#, Fairies
Computer test: WinChloe v3.51 finds 13995 Bosma solutions. However, in 13994 of these, the kings bump against one another. There might be another mate achievable only by dint of the kings *not* being adjacent, where Bosma condition would normally allow them to be closer.
FEN: 8/2nbp3/3k1b1R/3Pq3/4PK2/5rr1/1p4n1/8
Input: A.Buchanan, 2020-11-18
Last update: A.Buchanan, 2020-11-19 more...
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The problems of this query have been registered by the following contributors:

James Malcom (5)
A.Buchanan (6)