MESON Chess Problem Database
Problem Display
PID: 109905 (q4r1Q/B3P3/3pP3/1PNk1pR1/2rNnK2/2P5/B7/4R3 w - - 0 1)
Knieling, N
Caissa, 1980
#2
12 + 7
| 6490 | yacpdb | 2009 |
SOLUTION
- SOUND
- Sets
- 1...Rf6
- 2.Qxa8#
- 1...Rf7
- 2.Qxa8#
- 1...Rb8
- 2.Rxf5#
- 1...Rc8
- 2.Rxf5#
- 1...Rd8
- 2.Rxf5#
- 1...Re8
- 2.Rxf5#
- 1...Rg8
- 2.Rxf5#
- 1...Rxh8
- 2.Rxf5#
- 1...Sf6
- 2.Rxf5#
- 1...dxc5
- 2.Qe5#
- 1...Rf6
- Tries
- 1.Sc2?
- threat
- 2.Se3#
- 2.Sb4#
- 2.Qd4#
- 1...Sd2+
- 2.Qd4#
- 1...Sf2+
- 2.Qd4#
- 1...Sxc3+
- 2.Qd4#
- 1...Sg3+
- 2.Qd4#
- 1...Sxc5+
- 2.Qd4#
- 1...Sxg5+
- 2.Qd4#
- 1...Qxa7
- 2.Qd4#
- 1...Rxh8
- 2.Se3#
- 2.Sb4#
- 2.Rxf5#
- 1...dxc5
- 2.Qe5#
- 1...Rf6
- 2.Se3#
- 2.Sb4#
- 2.Qxa8#
- 1...Sf6+!
- threat
- 1.Sf3?
- threat
- 2.Qd4#
- 1...Rxh8
- 2.Rxf5#
- 1...dxc5
- 2.Qe5#
- 1...Rf6
- 2.Qxa8#
- 1...Sf6+!
- threat
- 1.Sc6?
- threat
- 2.Sb4#
- 2.Qd4#
- 1...Sd2+
- 2.Qd4#
- 1...Sf2+
- 2.Qd4#
- 1...Sxc3+
- 2.Qd4#
- 1...Sg3+
- 2.Qd4#
- 1...Sxc5+
- 2.Qd4#
- 1...Sxg5+
- 2.Qd4#
- 1...Qxc6
- 2.Qd4#
- 1...Qxa7
- 2.Qd4#
- 1...Rxh8
- 2.Sb4#
- 2.Rxf5#
- 1...dxc5
- 2.Qe5#
- 1...Rf6
- 2.Sb4#
- 1...Sf6+!
- threat
- 1.Sa6?
- threat
- 2.Sb4#
- 2.Sc7#
- 1...Qc6
- 2.Sb4#
- 1...Qb7
- 2.Sb4#
- 1...Qb8
- 2.Sb4#
- 1...Qc8
- 2.Sb4#
- 1...Qd8
- 2.Sb4#
- 1...Rc8
- 2.Sb4#
- 2.Rxf5#
- 1...Qxa7!
- threat
- 1.exf8Q?
- threat
- 2.Rxf5#
- 2.Qxf5#
- 2.Qxa8#
- 1...Qxa7
- 2.Rxf5#
- 2.Qxf5#
- 1...Sxc5
- 2.Rxf5#
- 2.Qxf5#
- 1...Sxg5
- 2.Qxf5#
- 2.Qxa8#
- 1...dxc5
- 2.Rxf5#
- 2.Qe5#
- 1...Qc6
- 2.Rxf5#
- 2.Qxf5#
- 1...Qb7
- 2.Rxf5#
- 2.Qxf5#
- 1...Qb8
- 2.Rxf5#
- 2.Qxf5#
- 1...Qc8
- 2.Rxf5#
- 2.Qxf5#
- 1...Qd8
- 2.Rxf5#
- 2.Qxf5#
- 1...Qe8
- 2.Rxf5#
- 2.Qxf5#
- 1...Sg3
- 2.Qxa8#
- 1...Sf6
- 2.Rxf5#
- 2.Qxa8#
- 1...Qxf8!
- threat
- 1.Sc2?
- Keys
- 1.Sxf5!
- threat
- 2.Qd4#
- 1...Rxf5+
- 2.Rxf5#
- 1...Sf6+
- 2.Sd4#
- 1...Rxh8
- 2.Se3#
- 1...dxc5
- 2.Qe5#
- 1...Rf6
- 2.Qxa8#
- threat
- 1.Sxf5!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 2
- ADDED MATES = 1
- REMOVED MATES = 6
- Sets
- R(g);OGATE::QAB(L),XQ(f)
- R(g);N_GUARD::R(H),XP(d)
- R(g);N_GUARD,XQ(L)::R(H),XP(d)
- S(b);P_PINS(D),S_CUTR(g)::R(H),XP(d)
- P(e);N_GUARD,XS(G)::QAR1(L)
- Tries
- Try
- S(D);
- Threat
- DUALS(3)
- Vars
- S(b);CHECK::QAR1(L)
- S(b);CHECK,XP(C)::QAR1(L)
- S(b);CHECK,XS(G)::QAR1(L)
- S(b);CHECK,N_SPINP(d),XR(H)::QAR1(L)
- Q(f);XB(J)::QAR1(L)
- P(e);N_GUARD,XS(G)::QAR1(L)
- Refutation
- S(b);CHECK
- Try
- S(D);
- Threat
- QAR1(L)
- Vars
- R(g);N_GUARD,XQ(L)::R(H),XP(d)
- P(e);N_GUARD,XS(G)::QAR1(L)
- R(g);OGATE::QAB(L),XQ(f)
- Refutation
- S(b);CHECK
- Try
- S(D);
- Threat
- DUALS(2)
- Vars
- S(b);CHECK::QAR1(L)
- S(b);CHECK,XP(C)::QAR1(L)
- S(b);CHECK,XS(G)::QAR1(L)
- S(b);CHECK,N_SPINP(d),XR(H)::QAR1(L)
- Q(f);XS(D)::QAR1(L)
- Q(f);XB(J)::QAR1(L)
- P(e);N_GUARD,XS(G)::QAR1(L)
- R(g);::S(D)
- Refutation
- S(b);CHECK
- Try
- S(G);
- Threat
- DUALS(2)
- Vars
- Q(f);::S(G)
- Refutation
- Q(f);XB(J)
- Try
- P(K);XR(g)
- Threat
- DUALS(3)
- Vars
- S(b);P_PINS(D)::QAB(K),XQ(f)
- Refutation
- Q(f);XQ(K)
- Try
- Actual
- S(D);P_SPINS(D),XP(d)
- Threat
- QAR1(L)
- Vars
- R(g);CHECK,OGATE,XS(D)::R(H),XR(g)
- S(b);CHECK,N_PINS(D)::R(H)+S(D)
- R(g);N_PINS(D),XQ(L)::R(H)+S(D),DCHECK
- P(e);N_GUARD,XS(G)::QAR1(L)
- R(g);OGATE::QAB(L),XQ(f)
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).