MESON Chess Problem Database
Problem Display
PID: 151589 (1qn5/6N1/4P3/1PB5/R4p1k/4P3/4N2K/6R1 w - - 0 1)
Ahlheim, Karl-Heinz
Die Schwalbe, 1962
#2
9 + 4
| 15148 | Sadier Collection | 2014 |
SOLUTION
- SOUND
- Sets
- 1...Qa7
- 2.Rxf4#
- 1...Qxb5
- 2.Rxf4#
- 1...Qb6
- 2.Rxf4#
- 1...Qb7
- 2.Rxf4#
- 1...Qa8
- 2.Rxf4#
- 1...Sb6
- 2.Be7#
- 1...Sd6
- 2.Rxf4#
- 1...Sa7
- 2.Be7#
- 1...Se7
- 2.Bxe7#
- 1...Qa7
- Tries
- 1.Sxf4?
- threat
- 2.Sf5#
- 1...Qxf4+
- 2.Rxf4#
- 1...Sd6
- 2.Sg6#
- 1...Se7
- 2.Bxe7#
- 1...Qe5!
- threat
- 1.exf4?
- threat
- 2.Bf2#
- 1...Qxf4+
- 2.Rxf4#
- 1...Qb6
- 2.f5#
- 1...Qa7!
- threat
- 1.Sxf4?
- Keys
- 1.Bb4!
- threat
- 2.Be1#
- 1...fxe3+
- 2.Bd6#
- 1...f3+
- 2.Bd6#
- threat
- 1.Bb4!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 2
- REMOVED MATES = 9
- Sets
- Q(c);N_GUARD::R(E),XP(a)
- Q(c);N_GUARD,XP(F)::R(E),XP(a)
- S(d);N_GUARD::B(G)
- S(d);S_CUTQ(c)::R(E),XP(a)
- S(d);N_GUARD::B(G),XS(d)
- Tries
- Try
- S(B);P_SPINS(B),XP(a)
- Threat
- S(I)
- Vars
- Q(c);CHECK,OGATE,P_SPINQ(c),XS(B)::R(E),XQ(c)
- S(d);N_PINS(B)::R(E)+S(B),DCHECK
- S(d);N_GUARD::B(G),XS(d)
- Refutation
- Q(c);
- Try
- P(D);P_SPINP(D),XP(a)
- Threat
- B(G)
- Vars
- Q(c);CHECK,OGATE,P_SPINQ(c),XP(D)::R(E),XQ(c)
- Q(c);N_PINP(D)::R(E)+P(D)
- Refutation
- Q(c);N_PINP(D)
- Try
- Actual
- B(G);N_PINP(a)
- Threat
- B(G)
- Vars
- P(a);CHECK,OGATEB,XP(D)::R(E)+B(G)
- P(a);CHECK,OGATEB::R(E)+B(G)
Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) &
CSS/Javascript (jQuery, Bootstrap & DataTables).