MESON Chess Problem Database
Problem Display
PID: 77427 (8/3r2BB/Q2q2RK/2N2k1N/3P1P2/4pp2/8/2n2b2 w - - 0 1)
Burger, Robert Eugene
Holladay, Edgar Dinwiddie
HM., The Problemist, 1990
#2
9 + 7
| 6232 | Holladay Chess Problems | 2007 |
SOLUTION
- SOUND
- Sets
- 1...Qxf4+
- 2.Rg5#
- 1...Qxc5
- 2.Rg1#
- 2.Rg2#
- 2.Rg3#
- 2.Rg5#
- 2.Qe6#
- 1...Qe5
- 2.Rg1#
- 2.Rg2#
- 2.Rg3#
- 2.Rg5#
- 1...Qc7
- 2.Rg1#
- 2.Rg2#
- 2.Rg3#
- 2.Rg5#
- 2.Qe6#
- 2.Qf6#
- 1...Qe7
- 2.Rg1#
- 2.Rg2#
- 2.Rg3#
- 2.Rg5#
- 1...Qb8
- 2.Rg1#
- 2.Rg2#
- 2.Rg3#
- 2.Rg5#
- 2.Qe6#
- 2.Qf6#
- 1...Qf8
- 2.Rg1#
- 2.Rg2#
- 2.Rg3#
- 2.Rg5#
- 2.Qe6#
- 1...Qxd4
- 2.Rg1#
- 2.Rg2#
- 2.Rg3#
- 2.Rg5#
- 2.Qe6#
- 1...Qd5
- 2.Rg1#
- 2.Rg2#
- 2.Rg3#
- 2.Rg5#
- 2.Qf6#
- 1...Qe6
- 2.Qxe6#
- 1...Qf6
- 2.Qxf6#
- 1...Qxg6+
- 2.Qxg6#
- 1...Se2
- 2.Qd3#
- 1...Qxf4+
- Tries
- 1.Se4?
- threat
- 2.Seg3#
- 1...Qxf4+
- 2.Rg5#
- 1...Qxg6+
- 2.Qxg6#
- 1...Kxe4
- 2.Rxd6#
- 1...Se2!
- threat
- 1.Sf6?
- threat
- 2.Rg4#
- 1...Qxf4+
- 2.Rg5#
- 1...Kxf4
- 2.Rg4#
- 1...Qxf6
- 2.Qxf6#
- 1...Rxg7!
- threat
- 1.Be5?
- threat
- 2.Sg3#
- 1...Qf8+
- 2.Rg7#
- 1...Qxg6+
- 2.Qxg6#
- 1...Qxe5
- 2.Rg5#
- 2.Rg7#
- 1...Se2
- 2.Qd3#
- 1...Rxh7+!
- threat
- 1.Bf6?
- threat
- 2.Rg5#
- 2.Rg7#
- 1...Qxf4+
- 2.Rg5#
- 1...Qf8+
- 2.Rg7#
- 1...Qxf6
- 2.Qxf6#
- 1...Rg7
- 2.Rg5#
- 2.Rxg7#
- 1...Rxh7+!
- threat
- 1.Qxd6?
- threat
- 2.Sg3#
- 2.Rg1#
- 2.Rg2#
- 2.Rg3#
- 2.Rg5#
- 2.Qe5#
- 2.Qe6#
- 2.Qf6#
- 2.Qxd7#
- 1...Rxg7
- 2.Sg3#
- 2.Sxg7#
- 2.Rg5#
- 2.Rxg7#
- 2.Qe5#
- 2.Qd5#
- 2.Qe6#
- 2.Qf6#
- 1...Ra7
- 2.Sg3#
- 2.Rg1#
- 2.Rg2#
- 2.Rg3#
- 2.Rg5#
- 2.Qe5#
- 2.Qd5#
- 2.Qe6#
- 2.Qf6#
- 1...Rb7
- 2.Sg3#
- 2.Rg1#
- 2.Rg2#
- 2.Rg3#
- 2.Rg5#
- 2.Qe5#
- 2.Qd5#
- 2.Qe6#
- 2.Qf6#
- 1...Rc7
- 2.Sg3#
- 2.Rg1#
- 2.Rg2#
- 2.Rg3#
- 2.Rg5#
- 2.Qe5#
- 2.Qd5#
- 2.Qe6#
- 2.Qf6#
- 1...Re7
- 2.Sg3#
- 2.Rg1#
- 2.Rg2#
- 2.Rg3#
- 2.Rg5#
- 2.Qf6#
- 1...Rf7
- 2.Sg3#
- 2.Rg1#
- 2.Rg2#
- 2.Rg3#
- 2.Rg5#
- 2.Qe5#
- 2.Qd5#
- 2.Qe6#
- 1...Rd8
- 2.Sg3#
- 2.Rg1#
- 2.Rg2#
- 2.Rg3#
- 2.Rg5#
- 2.Qe5#
- 2.Qe6#
- 2.Qf6#
- 1...Bg2
- 2.Sg3#
- 2.Rxg2#
- 2.Rg3#
- 2.Rg5#
- 2.Qe5#
- 2.Qe6#
- 2.Qf6#
- 2.Qxd7#
- 1...Bc4
- 2.Sg3#
- 2.Rg1#
- 2.Rg2#
- 2.Rg3#
- 2.Rg5#
- 2.Qe5#
- 2.Qf6#
- 1...Bb5
- 2.Sg3#
- 2.Rg1#
- 2.Rg2#
- 2.Rg3#
- 2.Rg5#
- 2.Qe5#
- 2.Qe6#
- 2.Qf6#
- 1...Se2
- 2.Rg1#
- 2.Rg2#
- 2.Rg3#
- 2.Rg5#
- 2.Qe5#
- 2.Qe6#
- 2.Qf6#
- 2.Qxd7#
- 1...Sd3
- 2.Sg3#
- 2.Rg1#
- 2.Rg2#
- 2.Rg3#
- 2.Rg5#
- 2.Qe6#
- 2.Qf6#
- 2.Qxd7#
- 1...Rxd6!
- threat
- 1.Se4?
- Keys
- 1.Se6!
- threat
- 2.Sg3#
- 1...Qxf4+
- 2.Rg5#
- 1...Ke4
- 2.Rg5#
- 1...Qxe6
- 2.Qxe6#
- 1...Se2
- 2.Qd3#
- threat
- 1.Se6!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 1
- REMOVED MATES = 2
- Sets
- Q(f);CHECK,N_PINR(F),XP(B)::B(I)+R(F),DCHECK
- Q(f);OGATE::QAB1(E),XQ(f)
- Q(f);OGATE::QAR1(E),XQ(f)
- Q(f);CHECK,OGATE,P_SPINQ(f),XR(F)::QAB1(E),XQ(f)
- S(a);N_GUARD,S_CUTB(b)::QAB(E)
- Tries
- Try
- S(C);
- Threat
- S(C)
- Vars
- Q(f);CHECK,N_PINR(F),XP(B)::B(I)+R(F),DCHECK
- Q(f);CHECK,OGATE,P_SPINQ(f),XR(F)::QAB1(E),XQ(f)
- K(e);S_FLIGHT,XS(C)::B(I)+R(F),XQ(f)
- Refutation
- S(a);
- Try
- S(D);N_SPINR(F)
- Threat
- B(I)+R(F)
- Vars
- Q(f);CHECK,SBLOCK,XP(B)::B(I)+R(F),DCHECK
- K(e);P-FLIGHT,XP(B)::R1(F)
- Q(f);OGATE,P_PINR(F),XS(D)::QAR1(E),XQ(f)
- Refutation
- R(g);XB(H)
- Try
- B(H);
- Threat
- S(D)
- Vars
- Q(f);CHECK,N_PINR(F)::B(I)+R(F)
- Q(f);CHECK,OGATE,P_SPINQ(f),XR(F)::QAB1(E),XQ(f)
- S(a);N_GUARD,S_CUTB(b)::QAB(E)
- Refutation
- R(g);CHECK,XB(I)
- Try
- B(H);N_SPINR(F)
- Threat
- DUALS(2)
- Vars
- Q(f);CHECK,XP(B)::B(I)+R(F),DCHECK
- Q(f);CHECK::B(I)+R(F)
- Q(f);OGATE,P_PINR(F),XB(H)::QAR1(E),XQ(f)
- Refutation
- R(g);CHECK,XB(I)
- Try
- Q(E);N_SPINR(F),XQ(f)
- Threat
- DUALS(9)
- Refutation
- R(g);P_PINR(F),XQ(E)
- Try
- Actual
- S(C);N_SPINR(F)
- Threat
- S(D)
- Vars
- Q(f);CHECK,XP(B)::B(I)+R(F),DCHECK
- K(e);S_FLIGHT::B(I)+R(F)
- Q(f);OGATE,P_PINR(F),XS(C)::QAB1(E),XQ(f)
- S(a);N_GUARD,S_CUTB(b)::QAB(E)
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).