MESON Chess Problem Database
Problem Display
PID: 249953 (b4rB1/KPBP4/P2R1Pp1/4kp1P/3Nr3/4bQ2/2n2P2/2q5 w - - 0 1)
Martin, Johann
Stella Polaris, 1969
#2
12 + 9
SOLUTION
- SOUND
- Sets
- 1...Rxd4
- 2.Re6#
- 1...Rf4
- 2.Qd5#
- 1...Rxf6
- 2.Rd5#
- 1...Re8
- 2.dxe8Q#
- 2.dxe8R#
- 1...Bd2
- 2.Sc6#
- 1...Bxd4+
- 2.Rb6#
- 1...Bf4
- 2.Sc6#
- 1...Bg5
- 2.Sc6#
- 1...Bh6
- 2.Sc6#
- 1...Sxd4
- 2.Rc6#
- 1...gxh5
- 2.Qxf5#
- 1...g5
- 2.Qxf5#
- 1...Rxd4
- Tries
- 1.Qg3+?
- 1...Bf4
- 2.Sf3#
- 2.Sc6#
- 1...f4
- 2.Qg5#
- 1...Rf4!
- 1...Bf4
- 1.d8Q?
- threat
- 2.Rd5#
- 2.Rb6#
- 2.Rc6#
- 2.Re6#
- 2.Rd7#
- 2.Qe7#
- 1...Bxd4+
- 2.Rxd4#
- 2.Rb6#
- 1...Rxd4
- 2.Rxd4#
- 2.Rd5#
- 2.Re6#
- 2.Qe7#
- 1...Rxf6
- 2.Rd5#
- 2.Re6#
- 2.Rxf6#
- 2.Qxf6#
- 1...Sxd4
- 2.Rd5#
- 2.Rc6#
- 2.Re6#
- 1...Qa3
- 2.Rd5#
- 2.Re6#
- 2.Qe7#
- 1...Rf7
- 2.Rd5#
- 2.Re6#
- 2.Rd7#
- 1...Re8
- 2.Rd5#
- 2.Rb6#
- 2.Rc6#
- 2.Re6#
- 2.Rd7#
- 2.Qxe8#
- 1...Sa1
- 2.Rd5#
- 2.Rc6#
- 2.Re6#
- 2.Qe7#
- 1...Se1
- 2.Rd5#
- 2.Rc6#
- 2.Re6#
- 2.Qe7#
- 1...Sa3
- 2.Rd5#
- 2.Rc6#
- 2.Re6#
- 2.Qe7#
- 1...Sb4
- 2.Rd5#
- 2.Rc6#
- 2.Re6#
- 2.Qe7#
- 1...Rxd8!
- threat
- 1.d8B?
- threat
- 2.Rd5#
- 2.Rd7#
- 1...Bxd4+
- 2.Rb6#
- 1...Rxd4
- 2.Rd5#
- 2.Re6#
- 1...Rxf6
- 2.Bxf6#
- 2.Rd5#
- 1...Rxg8
- 2.Rd7#
- 1...Sxd4
- 2.Rd5#
- 2.Rc6#
- 1...Qa3
- 2.Rd5#
- 1...Rf7
- 2.Rd7#
- 1...Sa1
- 2.Rd5#
- 1...Se1
- 2.Rd5#
- 1...Sa3
- 2.Rd5#
- 1...Sb4
- 2.Rd5#
- 1...Rxd8!
- threat
- 1.d8R?
- threat
- 2.Rb6#
- 2.Rc6#
- 2.Re6#
- 1...Bxd4+
- 2.Rb6#
- 1...Rxd4
- 2.Re6#
- 1...Rxf6
- 2.Rd5#
- 2.Re6#
- 1...Sxd4
- 2.Rc6#
- 2.Re6#
- 1...Qa3
- 2.Re6#
- 1...Rf7
- 2.Re6#
- 1...Sa1
- 2.Rc6#
- 2.Re6#
- 1...Se1
- 2.Rc6#
- 2.Re6#
- 1...Sa3
- 2.Rc6#
- 2.Re6#
- 1...Sb4
- 2.Rc6#
- 2.Re6#
- 1...Rxd8!
- threat
- 1.Qg3+?
- Keys
- 1.hxg6!
- threat
- 2.Qxf5#
- 1...Bxd4+
- 2.Rb6#
- 1...Rxd4
- 2.Re6#
- 1...Rxf6
- 2.Rd5#
- 1...Sxd4
- 2.Rc6#
- 1...Rf4
- 2.Qd5#
- 1...Bf4
- 2.Sc6#
- 1...f4
- 2.Qh5#
- threat
- 1.hxg6!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 1
- REMOVED MATES = 5
- Sets
- R(d);SBLOCK,XS(C)::B(J)+R(F),DCHECK
- R(d);OGATE,SBLOCK::QAR1(B)
- R(i);SBLOCK,XP(G)::B(J)+R(F),DCHECK
- R(i);OGATE::PXR(i)=Q
- B(c);N_PINS(C)::S(C)
- B(c);CHECK,SBLOCK,XS(C)::B(J)+R(F)
- S(b);SBLOCK,XS(C)::B(J)+R(F)
- P(g);N_GUARD,XP(D)::QAR1(B),XP(f)
- P(g);N_GUARD::QAR1(B),XP(f)
- Tries
- Try
- Q(B);CHECK
- Vars
- P(f);OGATEB,P_SPINP(f)::QAR2(B)
- Refutation
- R(d);P_SPINR(d)
- Try
- P(K);
- Threat
- DUALS(6)
- Refutation
- R(i);XQ(K)
- Try
- P(K);
- Threat
- DUALS(2)
- Vars
- B(c);CHECK,SBLOCK,XS(C)::B(J)+R(F)
- R(i);XB(L)::B(J)+R(F)
- Q(a);P_PINP(E)::B(J)+R(F),DCHECK
- R(i);::B(J)+R(F)
- S(b);::B(J)+R(F),DCHECK
- Refutation
- R(i);XB(K)
- Try
- P(K);
- Threat
- DUALS(3)
- Vars
- B(c);CHECK,XS(C)::B(J)+R(F)
- R(d);XS(C)::B(J)+R(F),DCHECK
- Q(a);P_PINP(E)::B(J)+R(F),DCHECK
- R(i);::B(J)+R(F),DCHECK
- Refutation
- R(i);XR(K)
- Try
- Actual
- P(D);XP(g)
- Threat
- QAR1(B),XP(f)
- Vars
- B(c);CHECK,SBLOCK,XS(C)::B(J)+R(F)
- R(d);SBLOCK,XS(C)::B(J)+R(F),DCHECK
- R(i);SBLOCK,XP(G)::B(J)+R(F),DCHECK
- S(b);SBLOCK,XS(C)::B(J)+R(F)
- R(d);OGATE,SBLOCK::QAR1(B)
- B(c);N_PINS(C)::S(C)
- P(f);OGATEB,SBLOCK::QAR(B)
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).