MESON Chess Problem Database
Problem Display
PID: 67819 (8/B7/Bq6/8/3rppQP/p4N1K/R1P2kNn/7R w - - 0 1)
Rains, Cyril George
Chess, 1948
#2
10 + 7
SOLUTION
- SOUND
- Sets
- 1...Qa5
- 2.c3#
- 1...Qc7
- 2.c3#
- 2.c4#
- 1...Qd8
- 2.c3#
- 2.c4#
- 1...Qb3
- 2.cxb3#
- 1...Qxa6
- 2.c4#
- 1...Qc6
- 2.c3#
- 2.c4#
- 1...Qd6
- 2.c3#
- 2.c4#
- 1...Qe6
- 2.c4#
- 1...Qf6
- 2.c3#
- 2.c4#
- 1...Qg6
- 2.c3#
- 2.c4#
- 1...Qh6
- 2.c3#
- 2.c4#
- 1...Rd3
- 2.cxd3#
- 1...Ra4
- 2.c3#
- 2.c4#
- 1...Rc4
- 2.c3#
- 1...Sf1
- 2.Rxf1#
- 1...Sxf3
- 2.Rf1#
- 1...Sxg4
- 2.Rf1#
- 1...Qa5
- Tries
- 1.Sxh2?
- threat
- 2.Rf1#
- 2.Qe2#
- 2.Qxf4#
- 1...Qb3+
- 2.cxb3#
- 1...Rd3+
- 2.cxd3#
- 1...Qxa6
- 2.c4#
- 1...Qc7
- 2.Rf1#
- 2.Qe2#
- 2.c3#
- 2.c4#
- 1...Qb1
- 2.Qe2#
- 2.Qxf4#
- 1...Qd6
- 2.Rf1#
- 2.Qe2#
- 2.c3#
- 2.c4#
- 1...Qe6
- 2.Rf1#
- 2.c4#
- 1...Qf6
- 2.Rf1#
- 2.Qe2#
- 2.c3#
- 2.c4#
- 1...Qh6
- 2.Rf1#
- 2.Qe2#
- 2.c3#
- 2.c4#
- 1...Qb8
- 2.Rf1#
- 2.Qe2#
- 1...Rd1
- 2.Qe2#
- 2.Qxf4#
- 1...Rd2
- 2.Rf1#
- 2.Qxf4#
- 1...Rc4
- 2.Rf1#
- 2.c3#
- 1...e3
- 2.Rf1#
- 2.Qe2#
- 2.Qf3#
- 1...f3
- 2.Rf1#
- 2.Qg3#
- 1...Qb5!
- threat
- 1.Sxd4?
- threat
- 2.Qe2#
- 1...Qb3+
- 2.cxb3#
- 1...Qxa6
- 2.c4#
- 1...Sxg4
- 2.Rf1#
- 1...Qe6
- 2.c4#
- 1...Sf3
- 2.Rf1#
- 1...f3
- 2.Qg3#
- 1...Qb5!
- threat
- 1.Bxb6?
- threat
- 2.c3#
- 2.c4#
- 1...Sxf3
- 2.Rf1#
- 1...Sxg4
- 2.Rf1#
- 1...Sf1
- 2.Rxf1#
- 1...e3!
- threat
- 1.Qxf4?
- threat
- 2.Sxh2#
- 2.Qe3#
- 2.Qg3#
- 1...Qxa6
- 2.Qe3#
- 2.c4#
- 1...Sxf3
- 2.Rf1#
- 2.Qe3#
- 2.Qg3#
- 1...exf3
- 2.Qe3#
- 2.Qg3#
- 1...Qb5
- 2.Qe3#
- 1...Rd3
- 2.cxd3#
- 1...Rc4
- 2.c3#
- 1...Qc7
- 2.Qe3#
- 2.c3#
- 2.c4#
- 1...Qb3
- 2.Qg3#
- 2.cxb3#
- 1...Qd6
- 2.Qe3#
- 2.c3#
- 2.c4#
- 1...Qf6
- 2.Qe3#
- 2.Qg3#
- 2.c3#
- 2.c4#
- 1...Qg6
- 2.Sxh2#
- 2.Qe3#
- 2.c3#
- 2.c4#
- 1...Qh6
- 2.Qg3#
- 2.c3#
- 2.c4#
- 1...Qb8
- 2.Qe3#
- 1...Rd1
- 2.Sxh2#
- 2.Qg3#
- 1...Rd2
- 2.Sxh2#
- 2.Qg3#
- 1...Ra4
- 2.Sxh2#
- 2.Qg3#
- 2.c3#
- 2.c4#
- 1...Rb4
- 2.Sxh2#
- 2.Qg3#
- 1...Rd5
- 2.Sxh2#
- 2.Qg3#
- 1...Rd6
- 2.Sxh2#
- 2.Qg3#
- 1...Rd7
- 2.Sxh2#
- 2.Qg3#
- 1...Rd8
- 2.Sxh2#
- 2.Qg3#
- 1...Sf1
- 2.Sfe1#
- 2.Sg1#
- 2.Sd2#
- 2.Sh2#
- 2.Sxd4#
- 2.Se5#
- 2.Sg5#
- 2.Rxf1#
- 1...Sg4
- 2.Sfe1#
- 2.Sg1#
- 2.Sd2#
- 2.Sh2#
- 2.Sxd4#
- 2.Se5#
- 2.Sg5#
- 2.Rf1#
- 2.Qg3#
- 1...e3
- 2.Qxe3#
- 2.Qg3#
- 1...Qe6+!
- threat
- 1.c3+?
- 1...Rd2
- 2.Rxd2#
- 1...Qb2!
- 1...Rd2
- 1.c4+?
- 1...Rd2
- 2.Rxd2#
- 1...Qb2!
- 1...Rd2
- 1.Sxh2?
- Keys
- 1.Sg5!
- threat
- 2.Qe2#
- 1...Qb3+
- 2.cxb3#
- 1...Rd3+
- 2.cxd3#
- 1...Qxa6
- 2.Sxe4#
- 2.c4#
- 1...Sxg4
- 2.Rf1#
- 1...Qb5
- 2.Sxe4#
- 1...Qe6
- 2.c4#
- 1...Rd2
- 2.Sxe4#
- 1...Rc4
- 2.c3#
- 1...Sf3
- 2.Rf1#
- 1...f3
- 2.Qg3#
- threat
- 1.Sg5!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 3
- REMOVED MATES = 3
- Sets
- Q(g);N_GUARD,P_SPINR(d)::R(B)+P(C)
- Q(g);OGATE,P_PINS(E),P_SPINR(d)::R(B)+P(C),XQ(g)
- Q(g);N_GUARD,P_SPINR(d),XB(I)::R(B)+P(C)
- Q(g);N_GUARD,P_PINQ(G),P_SPINR(d)::R(B)+P(C)
- R(d);OGATE,P_PINS(E),P_SPINQ(g)::R(B)+P(C),XR(d)
- R(d);N_GUARD,P_SPINQ(g)::R(B)+P(C)
- S(b);N_GUARD::R1(A),XS(b)
- S(b);N_GUARD,XS(E)::R1(A)
- S(b);N_GUARD,XQ(G)::R1(A)
- Tries
- Try
- S(E);XS(b)
- Threat
- DUALS(3)
- Vars
- Q(g);CHECK,OGATE,P_SPINR(d)::R(B)+P(C),XQ(g)
- R(d);CHECK,OGATE,P_SPINQ(g)::R(B)+P(C),XR(d)
- Q(g);N_GUARD,P_SPINR(d),XB(I)::R(B)+P(C)
- Refutation
- Q(g);P_SPINR(d)
- Try
- S(E);XR(d)
- Threat
- QAR1(G)
- Vars
- Q(g);CHECK,OGATE::R(B)+P(C),XQ(g)
- Q(g);N_GUARD,XB(I)::R(B)+P(C)
- S(b);N_GUARD,XQ(G)::R1(A)
- Q(g);N_GUARD,P_PINQ(G)::R(B)+P(C)
- S(b);N_GUARD::R1(A)
- P(f);N_GUARD::QAB1(G)
- Refutation
- Q(g);
- Try
- B(J);P_PINR(d),XQ(g)
- Threat
- DUALS(2)
- Vars
- S(b);N_GUARD,XS(E)::R1(A)
- S(b);N_GUARD,XQ(G)::R1(A)
- S(b);N_GUARD::R1(A),XS(b)
- Refutation
- P(e);N_SPINR(d)
- Try
- Q(G);XP(f)
- Threat
- DUALS(3)
- Vars
- Q(g);P_SPINR(d)::QAB1(G)
- R(d);OGATE,P_PINS(E),P_SPINQ(g)::R(B)+P(C),XR(d)
- R(d);N_GUARD,P_SPINQ(g)::R(B)+P(C)
- Refutation
- Q(g);CHECK,P_SPINR(d)
- Try
- P(C);CHECK
- Vars
- R(d);N_GUARD,P_SPINQ(g),P_SPINR(d)::R(B),XR(d)
- Refutation
- Q(g);P_SPINQ(g),P_SPINR(d)
- Try
- P(C);CHECK
- Vars
- R(d);N_GUARD,P_SPINQ(g),P_SPINR(d)::R(B),XR(d)
- Refutation
- Q(g);P_SPINQ(g),P_SPINR(d)
- Try
- Actual
- S(E);
- Threat
- QAR1(G)
- Vars
- Q(g);CHECK,OGATE,P_SPINR(d)::R(B)+P(C),XQ(g)
- R(d);CHECK,OGATE,P_SPINQ(g)::R(B)+P(C),XR(d)
- S(b);N_GUARD,XQ(G)::R1(A)
- Q(g);P_SPINR(d)::S(E),XP(e)
- Q(g);N_GUARD,P_PINQ(G),P_SPINR(d)::R(B)+P(C)
- R(d);N_GUARD,P_SPINQ(g)::S(E),XP(e)
- R(d);N_GUARD,P_SPINQ(g)::R(B)+P(C)
- S(b);N_GUARD::R1(A)
- P(f);N_GUARD::QAB1(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).