MESON Chess Problem Database
Problem Display
PID: 222218 (n7/1R2p3/P1k4q/4Q3/bB2N3/KP6/P3n1N1/2r2R1B w - - 0 1)
Barclay, William L
US Problem Bulletin, 1964
#2
11 + 7
SOLUTION
- SOUND
- Sets
- 1...Qe3
- 2.Qe6#
- 1...Qg5
- 2.Qe6#
- 1...Qg7
- 2.Qe6#
- 1...Qf8
- 2.Qe6#
- 1...Qxh1
- 2.Qe6#
- 1...Qh4
- 2.Qe6#
- 1...Qh5
- 2.Qe6#
- 1...Qe6
- 2.Qxe6#
- 1...Qh7
- 2.Qe6#
- 1...Qh8
- 2.Qe6#
- 1...Ra1
- 2.Qc5#
- 1...Rb1
- 2.Qc5#
- 1...Rd1
- 2.Qc5#
- 1...Re1
- 2.Qc5#
- 1...Rxf1
- 2.Qc5#
- 1...Rc5
- 2.Qxc5#
- 1...Bxb3
- 2.Qb5#
- 1...Bb5
- 2.Qxb5#
- 1...Sc3
- 2.Qc5#
- 1...Sf4
- 2.Rxc1#
- 1...Sb6
- 2.Rc7#
- 1...e6
- 2.Qd6#
- 1...Qe3
- Tries
- 1.Sf4?
- threat
- 2.Qd5#
- 1...Bxb3
- 2.Qb5#
- 1...Sxf4
- 2.Rxc1#
- 1...Sc7
- 2.Qxc7#
- 1...Qg5
- 2.Sg3#
- 2.Sxg5#
- 2.Qe6#
- 1...Qh5
- 2.Qe6#
- 1...Qd6
- 2.Sxd6#
- 1...Qe6
- 2.Qxe6#
- 1...Rd1
- 2.Qc5#
- 1...Rc5
- 2.Qxc5#
- 1...Sc3
- 2.Qc5#
- 1...Sb6
- 2.Rc7#
- 1...e6
- 2.Qd6#
- 1...Qxf4!
- threat
- 1.Sc3?
- threat
- 2.Sh4#
- 2.Qe4#
- 2.Qc5#
- 2.Qd5#
- 1...Qxh1
- 2.Qe4#
- 2.Qc5#
- 2.Qd5#
- 2.Qe6#
- 1...Rxf1
- 2.Qe4#
- 2.Qc5#
- 2.Qd5#
- 1...Rxc3
- 2.Qe4#
- 1...Bxb3
- 2.Qb5#
- 2.Qc5#
- 1...Sxc3
- 2.Qc5#
- 1...Sc7
- 2.Qxc7#
- 1...Qf4
- 2.Sxf4#
- 2.Qc5#
- 2.Qd5#
- 1...Qd2
- 2.Qc5#
- 1...Qe3
- 2.Sxe3#
- 2.Qd5#
- 1...Qg5
- 2.Qe6#
- 1...Qg7
- 2.Qe4#
- 2.Qc5#
- 2.Qd5#
- 2.Qe6#
- 1...Qf8
- 2.Sf4#
- 2.Qe4#
- 2.Qc5#
- 2.Qd5#
- 2.Qe6#
- 1...Qh2
- 2.Qe4#
- 2.Qc5#
- 2.Qd5#
- 1...Qh3
- 2.Qe4#
- 2.Qc5#
- 2.Qd5#
- 1...Qh4
- 2.Sxh4#
- 2.Qc5#
- 2.Qd5#
- 2.Qe6#
- 1...Qh5
- 2.Qe6#
- 1...Qe6
- 2.Qc5#
- 2.Qxe6#
- 1...Qf6
- 2.Sf4#
- 2.Qe4#
- 2.Qc5#
- 2.Qd5#
- 1...Qg6
- 2.Qc5#
- 2.Qd5#
- 1...Qh7
- 2.Qc5#
- 2.Qd5#
- 2.Qe6#
- 1...Rd1
- 2.Qc5#
- 1...Sg1
- 2.Qe4#
- 2.Qc5#
- 2.Qd5#
- 1...Sg3
- 2.Qc5#
- 2.Qd5#
- 1...Sd4
- 2.Qe4#
- 2.Qc5#
- 2.Qd5#
- 1...Sf4
- 2.Qc5#
- 1...Sb6
- 2.Rc7#
- 2.Qc7#
- 2.Qc5#
- 1...e6
- 2.Sh4#
- 2.Qd6#
- 2.Qe4#
- 2.Qc5#
- 1...Qd6!
- threat
- 1.Sf6?
- threat
- 2.Sh4#
- 2.Qe4#
- 2.Qd5#
- 2.Qe6#
- 1...Qxh1
- 2.Qe4#
- 2.Qd5#
- 2.Qe6#
- 1...Qxf6
- 2.Sf4#
- 2.Qe4#
- 1...Rxf1
- 2.Qe4#
- 2.Qc5#
- 2.Qd5#
- 2.Qe6#
- 1...Bxb3
- 2.Qb5#
- 1...exf6
- 2.Sh4#
- 2.Qd6#
- 2.Qe4#
- 2.Qe6#
- 1...Qf4
- 2.Sxf4#
- 2.Qd5#
- 1...Qe3
- 2.Sxe3#
- 2.Qd5#
- 1...Qg5
- 2.Qe6#
- 1...Qg7
- 2.Qe4#
- 2.Qd5#
- 2.Qe6#
- 1...Qh2
- 2.Qe4#
- 2.Qd5#
- 1...Qh3
- 2.Qe4#
- 2.Qd5#
- 1...Qh4
- 2.Sxh4#
- 2.Qd5#
- 2.Qe6#
- 1...Qh5
- 2.Qe6#
- 1...Qg6
- 2.Qd5#
- 2.Qe6#
- 1...Qh7
- 2.Qd5#
- 2.Qe6#
- 1...Rd1
- 2.Qc5#
- 1...Rc3
- 2.Qe4#
- 2.Qd5#
- 2.Qe6#
- 1...Rc4
- 2.Qd5#
- 2.Qe6#
- 1...Rc5
- 2.Qxc5#
- 2.Qe6#
- 1...Sg1
- 2.Qe4#
- 2.Qd5#
- 2.Qe6#
- 1...Sc3
- 2.Qc5#
- 2.Qe6#
- 1...Sg3
- 2.Qd5#
- 2.Qe6#
- 1...Sd4
- 2.Qe4#
- 2.Qd5#
- 1...Sf4
- 2.Rxc1#
- 1...Sb6
- 2.Rc7#
- 1...Sc7
- 2.Qxc7#
- 1...e6
- 2.Sh4#
- 2.Qd6#
- 2.Qe4#
- 2.Qxe6#
- 1...Qd2!
- threat
- 1.Rxc1+?
- 1...Sxc1
- 2.Qc5#
- 1...Sc3
- 2.Rxc3#
- 2.Qc5#
- 1...Qxc1+!
- 1...Sxc1
- 1.Rf6+?
- 1...exf6
- 2.Qd6#
- 2.Qe6#
- 1...e6
- 2.Qd6#
- 2.Qxe6#
- 1...Qxf6!
- 1...exf6
- 1.Rc7+?
- 1...Kb6
- 2.Qa5#
- 1...Sxc7!
- 1...Kb6
- 1.Sf4?
- Keys
- 1.Se3!
- threat
- 2.Qd5#
- 1...Qxe3
- 2.Qe6#
- 1...Bxb3
- 2.Qb5#
- 1...Sc7
- 2.Qxc7#
- 1...Qg5
- 2.Sg3#
- 2.Sxg5#
- 2.Qe6#
- 1...Qh5
- 2.Qe6#
- 1...Qd6
- 2.Sxd6#
- 1...Qe6
- 2.Qxe6#
- 1...Rd1
- 2.Qc5#
- 1...Rc5
- 2.Qxc5#
- 1...Sc3
- 2.Qc5#
- 1...Sf4
- 2.Rxc1#
- 1...Sb6
- 2.Rc7#
- 1...e6
- 2.Qd6#
- threat
- 1.Se3!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 2
- REMOVED MATES = 12
- Sets
- Q(e);N_GUARD,P_PINP(F)::QAR2(I)
- Q(e);N_GUARD::QAR2(I)
- Q(e);N_GUARD,XB(B)::QAR2(I)
- Q(e);N_GUARD::QAR2(I),XQ(e)
- R(a);N_GUARD,P_PINP(C)::QAR1(I)
- R(a);N_GUARD::QAR1(I)
- R(a);N_GUARD,XR(A)::QAR1(I)
- R(a);N_GUARD::QAR1(I),XR(a)
- B(c);N_GUARD,XP(F)::QAB1(I)
- B(c);N_GUARD::QAB1(I),XB(c)
- S(b);S_CUTR(a)::QAR1(I)
- S(b);N_GUARD,S_CUTQ(e)::R(A),XR(a)
- S(g);N_GUARD,SBLOCK::R1(K)
- P(f);N_GUARD,S_CUTQ(e)::QAR1(I)
- Tries
- Try
- S(D);
- Threat
- QAB1(I)
- Vars
- B(c);N_GUARD,XP(F)::QAB1(I)
- S(b);N_GUARD,XS(D)::R(A),XR(a)
- S(g);N_GUARD::QAR1(I),XS(g)
- Q(e);N_GUARD::QAR2(I)
- Q(e);N_GUARD,P_PINB(G)::B(B)+S(H),XQ(e)
- Q(e);N_GUARD::QAR2(I),XQ(e)
- R(a);N_GUARD::QAR1(I)
- R(a);N_GUARD::QAR1(I),XR(a)
- S(b);S_CUTR(a)::QAR1(I)
- S(g);N_GUARD,SBLOCK::R1(K)
- P(f);N_GUARD,S_CUTQ(e)::QAR1(I)
- Refutation
- Q(e);XS(D)
- Try
- S(H);
- Threat
- DUALS(4)
- Vars
- R(a);P_PINP(F),XS(H)::QAB(I)
- S(b);XS(H)::QAR1(I)
- S(g);N_GUARD::QAR1(I),XS(g)
- Q(e);::QAR1(I)
- Q(e);N_GUARD::QAR2(I)
- R(a);::QAR1(I)
- S(b);::QAR1(I)
- Refutation
- Q(e);P_PINB(G)
- Try
- S(H);
- Threat
- DUALS(4)
- Vars
- B(c);N_GUARD,XP(F)::QAB1(I)
- Q(e);::QAR2(I)
- R(a);N_GUARD::QAR1(I)
- S(b);N_GUARD,S_CUTQ(e)::R(A),XR(a)
- S(g);N_GUARD,SBLOCK::R1(K)
- S(g);N_GUARD::QAR1(I),XS(g)
- Refutation
- Q(e);
- Try
- R(A);CHECK,XR(a)
- Vars
- S(b);XR(A)::QAR1(I)
- Refutation
- Q(e);CHECK,XR(A)
- Try
- R(A);CHECK
- Refutation
- Q(e);XR(A)
- Try
- R(K);CHECK
- Vars
- K(d);P-FLIGHT::QAB1(I)
- Refutation
- S(g);XR(K)
- Try
- Actual
- S(D);
- Threat
- QAB1(I)
- Vars
- Q(e);N_GUARD,P_PINP(F),XS(D)::QAR2(I)
- B(c);N_GUARD,XP(F)::QAB1(I)
- S(g);N_GUARD::QAR1(I),XS(g)
- Q(e);N_GUARD::QAR2(I)
- Q(e);N_GUARD,P_PINB(G)::B(B)+S(H),XQ(e)
- Q(e);N_GUARD::QAR2(I),XQ(e)
- R(a);N_GUARD::QAR1(I)
- R(a);N_GUARD::QAR1(I),XR(a)
- S(b);S_CUTR(a)::QAR1(I)
- S(b);N_GUARD::R(A),XR(a)
- S(g);N_GUARD,SBLOCK::R1(K)
- P(f);N_GUARD,S_CUTQ(e)::QAR1(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).