MESON Chess Problem Database
Problem Display
PID: 11171 (1B4K1/b7/8/3R1Q2/7p/1nN5/q3p2N/r3RBkr w - - 0 1)
Boorer, PA
Chess, 1937
#2
8 + 8
SOLUTION
- SOUND
- Sets
- 1...Qb1
- 2.Sxe2#
- 1...Qa3
- 2.Sxe2#
- 1...Qa4
- 2.Sxe2#
- 1...Qa5
- 2.Sxe2#
- 1...Bf2
- 2.Sf3#
- 1...Sc1
- 2.Bh3#
- 1...Sd2
- 2.Sxe2#
- 1...exf1Q
- 2.Qxf1#
- 1...exf1S
- 2.Qxf1#
- 1...exf1B
- 2.Qxf1#
- 1...exf1R
- 2.Qxf1#
- 1...Qb1
- Tries
- 1.Se4?
- threat
- 2.Sf3#
- 2.Qg4#
- 2.Qg6#
- 2.Qg5#
- 1...Rxe1
- 2.Qg4#
- 2.Qg6#
- 2.Qg5#
- 1...Bxb8
- 2.Sf3#
- 2.Qf2#
- 1...exf1Q
- 2.Qxf1#
- 1...exf1S
- 2.Qxf1#
- 1...exf1B
- 2.Qxf1#
- 1...exf1R
- 2.Qxf1#
- 1...Qd2
- 2.Sf3#
- 2.Qg4#
- 1...Qa6
- 2.Sf3#
- 2.Qg4#
- 2.Qg5#
- 1...Bf2
- 2.Sf3#
- 2.Qxf2#
- 1...Be3
- 2.Sf3#
- 2.Qg4#
- 1...Sd2
- 2.Qg4#
- 2.Qg6#
- 2.Qg5#
- 1...Sd4
- 2.Qg4#
- 2.Qg6#
- 2.Qf2#
- 2.Qg5#
- 1...Rxh2!
- threat
- 1.Bxe2+?
- 1...Kg2
- 2.Qf3#
- 1...Rxe1!
- 1...Kg2
- 1.Bg2+?
- 1...Kxg2
- 2.Qf3#
- 1...Rxe1!
- 1...Kxg2
- 1.Rxe2?
- threat
- 2.Qg4#
- 2.Qg6#
- 2.Qg5#
- 1...Qxe2
- 2.Sxe2#
- 1...Bxb8
- 2.Qf2#
- 1...Qb1
- 2.Rg2#
- 2.Qg4#
- 2.Qg5#
- 1...Qc2
- 2.Qg4#
- 2.Qg5#
- 1...Qd2
- 2.Qg4#
- 1...Qa4
- 2.Rg2#
- 1...Qa6
- 2.Rg2#
- 2.Qg4#
- 2.Qg5#
- 1...Bf2
- 2.Qxf2#
- 1...Be3
- 2.Qg4#
- 1...Rxh2!
- threat
- 1.Qh3?
- threat
- 2.Qg2#
- 1...Rxh2
- 2.Qxh2#
- 1...exf1Q
- 2.Qxf1#
- 1...exf1S
- 2.Qxf1#
- 1...exf1B
- 2.Qxf1#
- 1...exf1R
- 2.Qxf1#
- 1...Kf2!
- threat
- 1.Qf2+?
- 1...Bxf2
- 2.Sf3#
- 1...Kxf2!
- 1...Bxf2
- 1.Qf3?
- threat
- 2.Rg5#
- 2.Qg2#
- 1...Bxb8
- 2.Qg2#
- 1...exf1Q
- 2.Qxf1#
- 1...exf1S
- 2.Qxf1#
- 1...exf1B
- 2.Qxf1#
- 1...exf1R
- 2.Qxf1#
- 1...Qd2
- 2.Qg2#
- 1...Qa4
- 2.Sxe2#
- 2.Qg2#
- 1...Qa5
- 2.Sxe2#
- 2.Qg2#
- 1...Bf2
- 2.Qg2#
- 1...Be3
- 2.Qg2#
- 2.Qxe3#
- 1...Sc1
- 2.Bxe2#
- 2.Bg2#
- 2.Bh3#
- 2.Qg2#
- 1...Sd2
- 2.Sxe2#
- 2.Qg2#
- 1...Sd4
- 2.Qg2#
- 2.Qe3#
- 1...Sa5
- 2.Qg2#
- 1...Sc5
- 2.Qg2#
- 2.Qe3#
- 1...h3
- 2.Rg5#
- 2.Qg3#
- 1...Rxh2!
- threat
- 1.Se4?
- Keys
- 1.Qf4!
- threat
- 2.Rg5#
- 1...Rxh2
- 2.Qxh2#
- 1...exf1Q
- 2.Qxf1#
- 1...exf1S
- 2.Qxf1#
- 1...exf1B
- 2.Qxf1#
- 1...exf1R
- 2.Qxf1#
- 1...Qa5
- 2.Sxe2#
- 1...Bf2
- 2.Sf3#
- 1...Sc1
- 2.Bh3#
- 1...Sd2
- 2.Sxe2#
- 1...Sd4
- 2.Qe3#
- 1...Sa5
- 2.Bxa7#
- 1...Sc5
- 2.Qe3#
- 2.Qd4#
- threat
- 1.Qf4!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 3
- REMOVED MATES = 3
- Sets
- Q(d);N_GUARD::S(D),XP(e)
- B(h);SBLOCK::S(C)
- S(f);P_PINR(E),S_CUTR(a)::R(A)+B(B)
- S(f);P_PINR(E),S_CUTQ(d)::S(D),XP(e)
- P(e);OGATE,P_SPINQ(e),XB(B)::QAR1(F),XQ(e)
- P(e);OGATE,P_SPINS(e),XB(B)::QAR1(F),XS(e)
- P(e);OGATE,P_SPINB(e),XB(B)::QAR1(F),XB(e)
- P(e);OGATE,P_SPINR(e),XB(B)::QAR1(F),XR(e)
- Tries
- Try
- S(D);
- Threat
- DUALS(4)
- Vars
- P(e);OGATE,P_SPINQ(e),XB(B)::QAR1(F),XQ(e)
- P(e);OGATE,P_SPINS(e),XB(B)::QAR1(F),XS(e)
- P(e);OGATE,P_SPINB(e),XB(B)::QAR1(F),XB(e)
- P(e);OGATE,P_SPINR(e),XB(B)::QAR1(F),XR(e)
- Refutation
- R(c);XS(C)
- Try
- B(B);CHECK,XP(e)
- Vars
- K(b);P-FLIGHT::QAB1(F)
- Refutation
- R(a);XR(A)
- Try
- B(B);CHECK
- Vars
- K(b);P-FLIGHT,XB(B)::QAB1(F)
- Refutation
- R(a);XR(A)
- Try
- R(A);XP(e)
- Threat
- DUALS(3)
- Vars
- Q(d);XR(A)::S(D),XQ(d)
- B(h);N_GUARD,XB(G)::QAB1(F)
- Q(d);::QAR(F)
- Q(d);N_GUARD::R1(A)
- B(h);N_GUARD::QAB1(F),XB(h)
- B(h);::QAR(F)
- Refutation
- R(c);XS(C)
- Try
- Q(F);
- Threat
- QAR1(F)
- Vars
- R(c);OGATE,XS(C)::QAB1(F),XR(c)
- P(e);OGATE,P_SPINQ(e),XB(B)::QAR1(F),XQ(e)
- P(e);OGATE,P_SPINS(e),XB(B)::QAR1(F),XS(e)
- P(e);OGATE,P_SPINB(e),XB(B)::QAR1(F),XB(e)
- P(e);OGATE,P_SPINR(e),XB(B)::QAR1(F),XR(e)
- Refutation
- K(b);S_FLIGHT
- Try
- Q(F);CHECK
- Vars
- B(h);SBLOCK,XQ(F)::S(C)
- Refutation
- K(b);S_FLIGHT,XQ(F)
- Try
- Q(F);
- Threat
- DUALS(2)
- Vars
- B(h);XB(G)::QAR1(F)
- P(e);OGATE,P_SPINQ(e),XB(B)::QAR1(F),XQ(e)
- P(e);OGATE,P_SPINS(e),XB(B)::QAR1(F),XS(e)
- P(e);OGATE,P_SPINB(e),XB(B)::QAR1(F),XB(e)
- P(e);OGATE,P_SPINR(e),XB(B)::QAR1(F),XR(e)
- Q(d);::QAR1(F)
- B(h);::QAR1(F)
- S(f);P_PINR(E)::QAR1(F)
- Refutation
- R(c);XS(C)
- Try
- Actual
- Q(F);
- Threat
- R(E)
- Vars
- R(c);OGATE,XS(C)::QAB1(F),XR(c)
- P(e);OGATE,P_SPINQ(e),XB(B)::QAR1(F),XQ(e)
- P(e);OGATE,P_SPINS(e),XB(B)::QAR1(F),XS(e)
- P(e);OGATE,P_SPINB(e),XB(B)::QAR1(F),XB(e)
- P(e);OGATE,P_SPINR(e),XB(B)::QAR1(F),XR(e)
- Q(d);N_GUARD::S(D),XP(e)
- B(h);SBLOCK::S(C)
- S(f);P_PINR(E),S_CUTR(a)::R(A)+B(B)
- S(f);P_PINR(E),S_CUTQ(d)::S(D),XP(e)
- S(f);P_PINR(E),S_CUTB(h)::QAB(F)
- S(f);N_GUARD,P_PINR(E),S_CUTQ(d)::B(G),XB(h)
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).