MESON Chess Problem Database
Problem Display
PID: 184296 (2Q1N3/8/3P1pp1/qp1kn1nR/p2NR3/2p1Bp2/b3P3/1B4bK w - - 0 1)
Barclay, William A
The Problemist, 1980
#2
10 + 12
SOLUTION
- SOUND
- Sets
- 1...Sd3
- 2.Qc6#
- 1...Sc4
- 2.Qc6#
- 1...Sg4
- 2.Qc6#
- 1...Sc6
- 2.Qxc6#
- 1...Sd7
- 2.Qc6#
- 1...Sef7
- 2.Qc6#
- 1...Sh3
- 2.Qc6#
- 1...Sxe4
- 2.Bxa2#
- 2.Qc6#
- 1...Se6
- 2.Qc6#
- 1...Sgf7
- 2.Qc6#
- 1...Sh7
- 2.Qc6#
- 1...Sd3
- Tries
- 1.Sxb5?
- threat
- 2.Sxf6#
- 2.Rd4#
- 1...Qxb5
- 2.Rd4#
- 1...Bxe3
- 2.Sxf6#
- 1...Sxe4
- 2.Bxa2#
- 1...Sd3
- 2.Sxf6#
- 2.Qb7#
- 1...Qb4
- 2.Sxf6#
- 1...Qb6
- 2.Sxc3#
- 2.Sxf6#
- 1...Qd8
- 2.Sxc3#
- 2.Rd4#
- 1...Qa7
- 2.Sxc3#
- 2.Sxf6#
- 1...Sc4
- 2.Sxf6#
- 2.Qb7#
- 2.Qc5#
- 1...Sg4
- 2.Qb7#
- 2.Qc5#
- 1...Sc6
- 2.Sxf6#
- 2.Qe6#
- 1...Sd7
- 2.Qb7#
- 1...Sef7
- 2.Sxf6#
- 2.Qb7#
- 2.Qc5#
- 1...Se6
- 2.Sxf6#
- 2.Qb7#
- 1...Sh7
- 2.Rd4#
- 1...f5
- 2.Sf6#
- 2.Rd4#
- 1...Qc7!
- threat
- 1.Sf5?
- threat
- 2.Se7#
- 2.Sxf6#
- 2.Rd4#
- 1...Bxe3
- 2.Sxe3#
- 2.Se7#
- 2.Sxf6#
- 1...Bxb1
- 2.Sxf6#
- 2.Rd4#
- 1...Sxe4
- 2.Se7#
- 1...gxf5
- 2.Rd4#
- 1...Sd3
- 2.Sxf6#
- 2.Qb7#
- 1...c2
- 2.Sxf6#
- 2.Rd4#
- 1...Qb4
- 2.Se7#
- 2.Sxf6#
- 1...Qb6
- 2.Se7#
- 2.Sxf6#
- 1...Qd8
- 2.Rd4#
- 1...Qa7
- 2.Sxf6#
- 1...Sc4
- 2.Se7#
- 2.Sxf6#
- 2.Qb7#
- 2.Qc5#
- 1...Sg4
- 2.Se7#
- 2.Qb7#
- 2.Qc5#
- 1...Sc6
- 2.Sxf6#
- 1...Sd7
- 2.Se7#
- 2.Qb7#
- 1...Sef7
- 2.Se7#
- 2.Sxf6#
- 2.Qb7#
- 2.Qc5#
- 1...Se6
- 2.Se7#
- 2.Sxf6#
- 1...Sh7
- 2.Se7#
- 2.Rd4#
- 1...Qc7!
- threat
- 1.Bxa2+?
- 1...Sc4
- 2.Qc6#
- 1...Kxe4!
- 1...Sc4
- 1.Rxe5+?
- 1...fxe5
- 2.Qc6#
- 1...Kxe5!
- 1...fxe5
- 1.Qb7+?
- 1...Kc5
- 2.Sb3#
- 2.Se6#
- 1...Sc6
- 2.Qxc6#
- 1...Kc4!
- 1...Kc5
- 1.Qc7?
- threat
- 2.Sxf6#
- 1...Sxe4
- 2.Bxa2#
- 2.Qc6#
- 1...Sc6
- 2.Qxc6#
- 1...Sg4
- 2.Qc6#
- 1...Sd7
- 2.Qc6#
- 1...Sh7
- 2.Qc6#
- 1...f5
- 2.Sf6#
- 1...Qxc7!
- threat
- 1.Sxb5?
- Keys
- 1.Sc2!
- threat
- 2.Rd4#
- 1...Kxe4
- 2.Sxf6#
- 1...Bxe3
- 2.Sxe3#
- 1...Sxe4
- 2.Bxa2#
- 1...Qc7
- 2.Sb4#
- 1...Qb4
- 2.Sxb4#
- 1...Qb6
- 2.Sb4#
- 1...Qa7
- 2.Sb4#
- 1...Sd3
- 2.Qb7#
- 1...Sc4
- 2.Qb7#
- 1...Sg4
- 2.Qb7#
- 1...Sc6
- 2.Qe6#
- 1...Sd7
- 2.Qb7#
- 1...Sef7
- 2.Qb7#
- 1...Se6
- 2.Qb7#
- threat
- 1.Sc2!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 7
- ADDED MATES = 7
- REMOVED MATES = 3
- Sets
- S(i);N_GUARD,P_SPINS(j)::QAB1(I)
- S(i);N_GUARD,P_SPINS(j)::QAB1(I),XS(i)
- S(j);P_SPINS(i)::QAB1(I)
- Tries
- Try
- S(E);XP(g)
- Threat
- DUALS(2)
- Vars
- Q(f);XS(E)::R1(F)
- B(a);XB(D)::S(J),XP(k)
- S(j);P_SPINS(i),SBLOCK,XR(F)::B(A),XB(b)
- Q(f);::S(J),XP(k)
- S(i);N_GUARD,P_SPINS(j)::QAB(I)
- S(j);P_SPINS(i)::R1(F)
- Refutation
- Q(f);
- Try
- S(E);
- Threat
- DUALS(3)
- Vars
- S(j);XR(F)::S(E)
- P(l);XS(E)::R1(F)
- Q(f);::R1(F)
- Q(f);::S(J),XP(k)
- S(i);::S(J),XP(k)
- Refutation
- Q(f);
- Try
- B(A);CHECK,XB(b)
- Vars
- S(i);P_SPINS(i)::QAB1(I)
- Refutation
- K(h);S_FLIGHT,XR(F)
- Try
- R(F);CHECK,XS(i)
- Vars
- P(k);SBLOCK,XR(F)::QAB1(I)
- Refutation
- K(h);P-FLIGHT,P_SPINS(j),XR(F)
- Try
- Q(I);CHECK
- Vars
- S(i);N_GUARD,P_SPINS(j)::QAB1(I),XS(i)
- Refutation
- K(h);S_FLIGHT
- Try
- Q(I);
- Threat
- S(J),XP(k)
- Vars
- S(i);N_GUARD,P_SPINS(j)::QAB1(I),XS(i)
- S(i);N_GUARD,P_SPINS(j)::QAB1(I)
- S(j);P_SPINS(i)::QAB1(I)
- P(k);::S(J)
- Refutation
- Q(f);XQ(I)
- Try
- Actual
- S(E);
- Threat
- R1(F)
- Vars
- K(h);S_FLIGHT,XR(F)::S(J),XP(k)
- B(a);XB(D)::S(E),XB(a)
- S(j);P_SPINS(i),SBLOCK,XR(F)::B(A),XB(b)
- Q(f);N_GUARD::S(E)
- Q(f);N_GUARD::S(E),XQ(f)
- S(i);N_GUARD,P_SPINS(j)::QAB(I)
- S(i);P_SPINS(j),SBLOCK::QAB1(I)
- S(j);P_SPINS(i),SBLOCK::QAB(I)
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).