MESON Chess Problem Database
Problem Display
PID: 564 (2b2R2/Q2p4/1q3N1K/3BP2R/2p2k2/2B2n1P/8/5N2 w - - 0 1)
Quack, Godfrey C
4th HM., The Observer, 1964
#2
10 + 6
SOLUTION
- SOUND
- Sets
- 1...Qg1
- 2.Se4#
- 2.Sg4#
- 2.Sxd7#
- 2.Sh7#
- 2.Se8#
- 2.Sg8#
- 1...Qf2
- 2.Se4#
- 2.Sg4#
- 2.Sxd7#
- 2.Sh7#
- 2.Se8#
- 2.Sg8#
- 1...Qe3
- 2.Se4#
- 2.Sg4#
- 2.Sxd7#
- 2.Sh7#
- 2.Se8#
- 2.Sg8#
- 2.Qxe3#
- 1...Qd4
- 2.Se4#
- 2.Sg4#
- 2.Sxd7#
- 2.Sh7#
- 2.Se8#
- 2.Sg8#
- 1...Qa5
- 2.Se4#
- 2.Sg4#
- 2.Sxd7#
- 2.Sh7#
- 2.Se8#
- 2.Sg8#
- 2.Qe3#
- 1...Qxa7
- 2.Se4#
- 2.Sg4#
- 2.Sxd7#
- 2.Sh7#
- 2.Se8#
- 2.Sg8#
- 1...Qc7
- 2.Se4#
- 2.Sg4#
- 2.Sxd7#
- 2.Sh7#
- 2.Se8#
- 2.Sg8#
- 2.Qe3#
- 1...Qd8
- 2.Qe3#
- 1...Qb1
- 2.Se4#
- 2.Qe3#
- 1...Qb2
- 2.Se4#
- 2.Sg4#
- 2.Sxd7#
- 2.Sh7#
- 2.Se8#
- 2.Sg8#
- 2.Qe3#
- 1...Qb3
- 2.Se4#
- 2.Sg4#
- 2.Sxd7#
- 2.Sh7#
- 2.Se8#
- 2.Sg8#
- 2.Qe3#
- 1...Qb4
- 2.Qe3#
- 1...Qb5
- 2.Se4#
- 2.Sg4#
- 2.Sxd7#
- 2.Sh7#
- 2.Se8#
- 2.Sg8#
- 2.Qe3#
- 1...Qa6
- 2.Qe3#
- 1...Qc6
- 2.Qe3#
- 1...Qd6
- 2.Qe3#
- 1...Qe6
- 2.Qe3#
- 1...Qxf6+
- 2.Rxf6#
- 1...Qb7
- 2.Se4#
- 2.Sg4#
- 2.Sxd7#
- 2.Sh7#
- 2.Se8#
- 2.Sg8#
- 2.Qe3#
- 1...Qb8
- 2.Se4#
- 2.Sg4#
- 2.Sxd7#
- 2.Sh7#
- 2.Se8#
- 2.Sg8#
- 2.Qe3#
- 1...Sd4
- 2.Bd2#
- 1...Sxe5
- 2.Bxe5#
- 1...d6
- 2.Sd7#
- 1...Qg1
- Tries
- 1.Bd2+?
- 1...Qe3
- 2.Se4#
- 2.Sg4#
- 2.Sxd7#
- 2.Sh7#
- 2.Se8#
- 2.Sg8#
- 2.Bxe3#
- 2.Qxe3#
- 1...Sxd2!
- 1...Qe3
- 1.Rh4+?
- 1...Kf5
- 2.Sg3#
- 1...Sxh4!
- 1...Kf5
- 1.Qxb6?
- threat
- 2.Se4#
- 2.Sg4#
- 2.Sxd7#
- 2.Sh7#
- 2.Se8#
- 2.Sg8#
- 2.Qe3#
- 1...Sxe5
- 2.Bd2#
- 2.Bxe5#
- 2.Qe3#
- 2.Qd4#
- 1...Sd4
- 2.Bd2#
- 2.Qxd4#
- 1...Sh4
- 2.Bd2#
- 2.Qe3#
- 2.Qd4#
- 1...d6
- 2.Sd7#
- 2.Qe3#
- 1...Sg5!
- threat
- 1.Bd2+?
- Keys
- 1.Kg6!
- threat
- 2.Rf5#
- 1...Qg1+
- 2.Sg4#
- 1...Qb1+
- 2.Se4#
- 1...Qxf6+
- 2.Rxf6#
- 1...Sh4+
- 2.Rxh4#
- 1...Sxe5+
- 2.Bxe5#
- 1...Qe6
- 2.Qe3#
- 1...Sd4
- 2.Bd2#
- 1...Sg5
- 2.Rh4#
- 1...d6
- 2.Sd7#
- threat
- 1.Kg6!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 4
- REMOVED MATES = 5
- Sets
- Q(d);N_PINS(G),OGATE::QAB1(I)
- Q(d);OGATE::QAB1(I)
- Q(d);CHECK,OGATE,P_SPINQ(d),XS(G)::R(J),XQ(d)
- S(a);N_GUARD,S_CUTQ(d)::B(B)
- S(a);OGATE,XP(E)::B(B),XS(a)
- P(e);N_PINS(G)::R(J)+S(G)
- Tries
- Try
- B(B);CHECK
- Refutation
- S(a);XB(B)
- Try
- R(F);CHECK
- Vars
- K(c);P-FLIGHT::S(A)
- Refutation
- S(a);XR(F)
- Try
- Q(I);N_SPINS(G),XQ(d)
- Threat
- DUALS(7)
- Refutation
- S(a);
- Try
- Actual
- K(H);P-FLIGHT
- Threat
- R1(F)
- Vars
- Q(d);CHECK,N_PINS(G)::R(J)+S(G)
- Q(d);CHECK,OGATE,P_SPINQ(d),XS(G)::R(J),XQ(d)
- S(a);CHECK,N_GUARD::R(F),XS(a)
- S(a);CHECK,OGATE,XP(E)::B(B),XS(a)
- Q(d);OGATE::QAB1(I)
- S(a);N_GUARD,S_CUTQ(d)::B(B)
- S(a);N_GUARD::R(F)
- P(e);N_PINS(G)::R(J)+S(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).