MESON Chess Problem Database
Problem Display
PID: 6569 (5Bn1/R7/3Nk2n/p2p2P1/1q2NK2/1B6/3pQ3/8 w - - 0 1)
Easter, Norris
6th HM., Tijdschrift vd NSB, 1931
#2
8 + 7
SOLUTION
- SOUND
- Sets
- 1...Qa3
- 2.Sxd2#
- 2.Sf2#
- 2.Sc3#
- 2.Sg3#
- 2.Sc5#
- 2.Sf6#
- 1...Qc3
- 2.Sxc3#
- 2.Sc5#
- 1...Qc5
- 2.Sxc5#
- 1...Qxd6+
- 2.Sxd6#
- 1...Qxb3
- 2.Sc3#
- 2.Sc5#
- 1...Qxe4+
- 2.Qxe4#
- 1...Qb5
- 2.Sc5#
- 1...Qb6
- 2.Sc5#
- 1...Qb7
- 2.Sc5#
- 2.Sf6#
- 1...Qb8
- 2.Sxd2#
- 2.Sf2#
- 2.Sc3#
- 2.Sg3#
- 2.Sc5#
- 2.Sf6#
- 1...Sg4
- 2.Qxg4#
- 1...Sf7
- 2.Qg4#
- 1...Sf6
- 2.Re7#
- 1...Se7
- 2.Rxe7#
- 1...Qa3
- Tries
- 1.Kf3?
- threat
- 2.Sc5#
- 1...Qc3+
- 2.Sxc3#
- 1...Qxb3+
- 2.Sc3#
- 1...Qxe4+
- 2.Qxe4#
- 1...Qxd6
- 2.Sxd6#
- 1...Qc5
- 2.Sxc5#
- 1...Se7
- 2.Rxe7#
- 1...Ke5!
- threat
- 1.Sf7?
- threat
- 2.Sd8#
- 1...Qd6+
- 2.Sexd6#
- 1...Qxe4+
- 2.Qxe4#
- 1...Qb8+
- 2.Sed6#
- 1...Qxf8
- 2.Sxd2#
- 2.Sf2#
- 2.Sc3#
- 2.Sg3#
- 2.Sc5#
- 2.Sd6#
- 2.Sf6#
- 1...Sxf7
- 2.Qg4#
- 1...Qe7
- 2.Sed6#
- 1...Qb6
- 2.Sc5#
- 1...Qb7!
- threat
- 1.Bc4?
- threat
- 2.Sxd2#
- 2.Sf2#
- 2.Sc3#
- 2.Sg3#
- 2.Sc5#
- 2.Sf6#
- 1...Qxd6+
- 2.Sxd6#
- 1...dxc4
- 2.Sc3#
- 2.Sf6#
- 1...Qb7
- 2.Sc5#
- 2.Sf6#
- 1...d1Q
- 2.Sc5#
- 1...d1S
- 2.Sc5#
- 1...d1B
- 2.Sc5#
- 1...d1R
- 2.Sd2#
- 2.Sf2#
- 2.Sc3#
- 2.Sg3#
- 2.Sc5#
- 2.Sf6#
- 1...Qa3
- 2.Sc3#
- 2.Sc5#
- 1...Qc3
- 2.Sxc3#
- 2.Sc5#
- 1...Qc5
- 2.Sxc5#
- 1...Qb1
- 2.Sc5#
- 1...Qb2
- 2.Sc3#
- 2.Sc5#
- 1...Qb3
- 2.Sc3#
- 2.Sc5#
- 1...Qb6
- 2.Sc5#
- 1...Sg4
- 2.Sc5#
- 2.Qxg4#
- 1...Sf5
- 2.Sc5#
- 1...Sf7
- 2.Sc5#
- 2.Qg4#
- 1...Sf6
- 2.Sc5#
- 2.Sxf6#
- 2.Re7#
- 1...Se7
- 2.Rxe7#
- 1...Qxc4!
- threat
- 1.Qg4+?
- 1...Sf5
- 2.Qxf5#
- 1...Sxg4!
- 1...Sf5
- 1.Kf3?
- Keys
- 1.Qa6!
- threat
- 2.Qc8#
- 1...Qxd6+
- 2.Qxd6#
- 1...Qxe4+
- 2.Sxe4#
- 1...Qb7
- 2.Sc5#
- 1...Qc3
- 2.Sc4#
- 1...Qc5
- 2.Sxc5#
- 1...Qa4
- 2.Sb5#
- 1...Qc4
- 2.Sxc4#
- 1...Qb5
- 2.Sxb5#
- 1...Qb8
- 2.Sc5#
- 1...Sf6
- 2.Re7#
- 1...Se7
- 2.Rxe7#
- threat
- 1.Qa6!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 3
- ADDED MATES = 5
- REMOVED MATES = 3
- Sets
- Q(b);N_PINS(C)::QAR(A)+S(C),DCHECK,XQ(b)
- Q(b);CHECK,N_PINS(C),XS(F)::QAR(A)+S(C),XQ(b)
- Q(b);CHECK,OGATE,P_SPINQ(b),XS(C)::QAR2(A),XQ(b)
- Q(b);N_PINS(C)::QAR(A)+S(C),DCHECK
- S(f);N_GUARD::QAB(A),XS(f)
- S(f);N_GUARD::QAB(A)
- S(g);N_GUARD::R1(G)
- S(g);N_GUARD::R1(G),XS(g)
- Tries
- Try
- K(D);N_SPINS(C),P-FLIGHT
- Threat
- QAR(A)+S(C),DCHECK
- Vars
- Q(b);CHECK,N_GUARD::QAR(A)+S(C),XQ(b)
- Q(b);CHECK,N_GUARD,N_SPINP(d),XB(B)::QAR(A)+S(C)
- Q(b);CHECK,OGATE,P_SPINQ(b),XS(C)::QAR2(A),XQ(b)
- Q(b);XS(F)::QAR(A)+S(C),XQ(b)
- Q(b);::QAR(A)+S(C),DCHECK,XQ(b)
- S(g);N_GUARD::R1(G),XS(g)
- Refutation
- K(e);N_SPINP(d),P-FLIGHT
- Try
- S(F);
- Threat
- S(F)
- Vars
- Q(b);CHECK,N_PINS(C)::QAR(A)+S(C),XQ(b)
- Q(b);CHECK,OGATE,P_SPINQ(b),XS(C)::QAR2(A),XQ(b)
- Q(b);CHECK,N_PINS(C)::QAR(A)+S(C)
- S(f);N_GUARD,XS(F)::QAB(A)
- Q(b);N_PINS(C)::QAR(A)+S(C)
- Q(b);N_PINS(C)::QAR(A)+S(C),DCHECK
- Refutation
- Q(b);N_PINS(C)
- Try
- B(B);N_SPINS(C)
- Threat
- DUALS(6)
- Vars
- Q(b);CHECK,XS(F)::QAR(A)+S(C),XQ(b)
- P(a);::QAR(A)+S(C),DCHECK
- Q(b);::QAR(A)+S(C),DCHECK,XQ(b)
- Q(b);::QAR(A)+S(C),DCHECK
- S(f);::QAR(A)+S(C),DCHECK
- S(g);N_GUARD::R1(G),XS(g)
- Refutation
- Q(b);N_SPINP(d),P_PINS(C),XB(B)
- Try
- Q(A);CHECK
- Vars
- S(f);N_GUARD,P_SPINS(f)::QAB1(A),XS(f)
- Refutation
- S(f);XQ(A)
- Try
- Actual
- Q(A);
- Threat
- QAB(A)
- Vars
- Q(b);CHECK,N_PINS(C),OGATE,P_SPINQ(b),XS(F)::QAR1(A),XQ(b)
- Q(b);CHECK,XS(C)::QAR(A)+S(F),XQ(b)
- Q(b);N_PINS(C)::S(C)
- Q(b);N_GUARD,N_PINS(C)::QAR(A)+S(F)
- Q(b);N_PINS(C)::S(C),XQ(b)
- Q(b);N_GUARD::QAR(A)+S(F)
- Q(b);N_GUARD,N_SPINP(d)::QAR(A)+S(F),XQ(b)
- Q(b);N_GUARD,N_PINS(C)::QAR(A)+S(F),XQ(b)
- Q(b);N_PINS(C),P_PINS(F)::S(C)
- S(g);N_GUARD::R1(G)
- S(g);N_GUARD::R1(G),XS(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).