MESON Chess Problem Database
Problem Display
PID: 15175 (B7/bq1b1Q1p/p4B2/2n1r1R1/p2N1kp1/r2p1P2/1N1PP2P/5RK1 w - - 0 1)
Quack, Godfrey C
The Problemist, 1980
#2
12 + 12
SOLUTION
- SOUND
- Sets
- 1...Qe4
- 2.fxe4#
- 1...Qc8
- 2.fxg4#
- 1...Qxb2
- 2.fxg4#
- 1...Qb3
- 2.fxg4#
- 1...Qb4
- 2.fxg4#
- 1...Qb5
- 2.fxg4#
- 1...Qb6
- 2.fxg4#
- 1...Qc7
- 2.fxg4#
- 1...Qb8
- 2.fxg4#
- 1...Re4
- 2.fxg4#
- 1...Rd5
- 2.e3#
- 1...Rf5
- 2.Rxg4#
- 2.e3#
- 1...Rxg5
- 2.e3#
- 1...Re6
- 2.Rxg4#
- 2.Rf5#
- 1...Bb5
- 2.Rxg4#
- 1...Bc6
- 2.Rxg4#
- 1...Be8
- 2.Rxg4#
- 1...Sb3
- 2.Sxd3#
- 1...Se4
- 2.e3#
- 1...Se6
- 2.Rxg4#
- 1...g3
- 2.hxg3#
- 1...Qe4
- Tries
- 1.Be7+?
- 1...Bf5
- 2.Rxg4#
- 1...Rf5!
- 1...Bf5
- 1.Bg7+?
- 1...Rf5
- 2.Rxg4#
- 1...Bf5
- 2.Rxg4#
- 1...Kxg5!
- 1...Rf5
- 1.Bd8+?
- 1...Bf5
- 2.Rxg4#
- 1...Rf5!
- 1...Bf5
- 1.Bh8+?
- 1...Rf5
- 2.Rxg4#
- 1...Bf5
- 2.Rxg4#
- 1...Kxg5!
- 1...Rf5
- 1.Rxe5?
- threat
- 2.e3#
- 1...dxe2
- 2.Sxe2#
- 1...Qe4
- 2.fxe4#
- 1...gxf3!
- threat
- 1.Rf5+?
- 1...Rxf5
- 2.e3#
- 1...Bxf5!
- 1...Rxf5
- 1.Rh5?
- threat
- 2.Bxe5#
- 2.Bg5#
- 1...Rxe2
- 2.Be5#
- 1...Rxh5
- 2.e3#
- 1...Rf5
- 2.e3#
- 1...Re3
- 2.Be5#
- 1...Re4
- 2.Be5#
- 1...Rd5
- 2.Be5#
- 2.e3#
- 1...Rg5
- 2.e3#
- 1...Re6
- 2.Be5#
- 2.Rf5#
- 1...Re7
- 2.Be5#
- 1...Re8
- 2.Be5#
- 1...Bf5
- 2.Bg5#
- 1...gxf3!
- threat
- 1.Qe6?
- threat
- 2.Rxg4#
- 2.Qxe5#
- 1...Rxe2
- 2.Rxg4#
- 2.Rf5#
- 1...Rxg5
- 2.Qe3#
- 2.e3#
- 1...Rxe6
- 2.Rxg4#
- 2.Rf5#
- 1...Sxe6
- 2.Rxg4#
- 1...gxf3
- 2.Rg4#
- 2.Qxe5#
- 1...Rf5
- 2.Rxg4#
- 2.Rxf5#
- 2.Qe3#
- 2.e3#
- 1...Qe4
- 2.Rxg4#
- 2.fxe4#
- 1...Qd5
- 2.Rxg4#
- 1...Qc7
- 2.Rxg4#
- 2.fxg4#
- 1...Qb8
- 2.Rxg4#
- 2.fxg4#
- 1...Re3
- 2.Rxg4#
- 2.Rf5#
- 2.Qxe3#
- 2.dxe3#
- 1...Re4
- 2.Rxg4#
- 2.Rf5#
- 2.fxe4#
- 2.fxg4#
- 1...Rd5
- 2.Rxg4#
- 2.Qe3#
- 2.e3#
- 2.fxg4#
- 1...Bb8
- 2.Rxg4#
- 1...g3
- 2.Rg4#
- 2.Qxe5#
- 2.hxg3#
- 1...h5
- 2.Qxe5#
- 1...Bxe6!
- threat
- 1.Qxd7?
- threat
- 2.Rxg4#
- 2.Qxg4#
- 1...Qxd7
- 2.fxg4#
- 1...Rxg5
- 2.e3#
- 1...Sxd7
- 2.Rxg4#
- 1...gxf3
- 2.Rg4#
- 2.Qg4#
- 1...Rf5
- 2.Rxg4#
- 2.Rxf5#
- 2.Qxf5#
- 2.e3#
- 1...Qc8
- 2.Rxg4#
- 2.fxg4#
- 1...Re6
- 2.Rxg4#
- 2.Rf5#
- 1...Se6
- 2.Rxg4#
- 1...g3
- 2.Rg4#
- 2.Qg4#
- 2.hxg3#
- 1...h5!
- threat
- 1.fxg4+?
- 1...Qf3
- 2.Rxf3#
- 1...Ke4!
- 1...Qf3
- 1.Be7+?
- Keys
- 1.Qc4!
- threat
- 2.Se6#
- 1...Rxg5
- 2.e3#
- 1...Qe4
- 2.fxe4#
- 1...Re4
- 2.fxg4#
- 1...Re6
- 2.Sxe6#
- 2.Rxg4#
- 2.Rf5#
- 1...Be6
- 2.Sxe6#
- 1...Sb3
- 2.Sxd3#
- 1...Se4
- 2.e3#
- 1...Se6
- 2.Rxg4#
- threat
- 1.Qc4!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 1
- REMOVED MATES = 13
- Sets
- Q(j);OGATE::R(A)+P(G),XQ(j)
- Q(j);N_GUARD::R(A)+P(G),XP(e)
- Q(j);N_GUARD,XS(C)::R(A)+P(G),XP(e)
- R(g);SBLOCK,S_CUTQ(j)::R(A)+P(G),XP(e)
- R(g);N_GUARD::P(E)
- R(g);N_GUARD,XR(I)::P(E)
- B(k);N_GUARD::R1(I),XP(e)
- S(f);N_GUARD,P_PINS(H),S_CUTR(a)::S(C),XP(b)
- S(f);P_PINS(H),S_CUTR(g)::P(E)
- S(f);P_PINS(H),S_CUTB(k)::R1(I),XP(e)
- P(e);OGATE::P(F),XP(e)
- Tries
- Try
- B(J);CHECK
- Vars
- B(k);P_SPINB(k)::R1(I),XP(e)
- Refutation
- R(g);P_SPINR(g)
- Try
- B(J);CHECK
- Vars
- R(g);P_SPINR(g)::R1(I),XP(e)
- B(k);P_SPINB(k)::R1(I),XP(e)
- Refutation
- K(d);S_FLIGHT,XR(I)
- Try
- B(J);CHECK
- Vars
- B(k);P_SPINB(k)::R1(I),XP(e)
- Refutation
- R(g);P_SPINR(g)
- Try
- B(J);CHECK
- Vars
- R(g);P_SPINR(g)::R1(I),XP(e)
- B(k);P_SPINB(k)::R1(I),XP(e)
- Refutation
- K(d);S_FLIGHT,XR(I)
- Try
- R(I);XR(g)
- Threat
- P(E)
- Vars
- P(b);XP(E)::S(H),XP(b)
- Q(j);OGATE::R(A)+P(G),XQ(j)
- Refutation
- P(e);P_SPINP(e),XP(G)
- Try
- R(I);CHECK
- Vars
- R(g);XR(I)::P(E)
- Refutation
- B(k);XR(I)
- Try
- R(I);
- Threat
- DUALS(2)
- Vars
- R(g);XP(E)::QAR(K)+B(J),DCHECK
- R(g);N_GUARD,XR(I)::P(E)
- R(g);N_GUARD::P(E)
- R(g);::QAR(K)+B(J),DCHECK
- B(k);::B(J)
- Refutation
- P(e);P_SPINP(e),XP(G)
- Try
- Q(K);
- Threat
- DUALS(2)
- Vars
- S(f);P_PINS(H),XQ(K)::R1(I),XP(e)
- Q(j);::R1(I),XP(e)
- B(i);::R1(I),XP(e)
- P(l);::QAB1(K),XR(g)
- Refutation
- B(k);XQ(K)
- Try
- Q(K);XB(k)
- Threat
- DUALS(2)
- Vars
- Q(j);N_GUARD,XQ(K)::R(A)+P(G),XP(e)
- R(g);N_GUARD,XR(I)::P(E)
- S(f);P_PINS(H),XQ(K)::R1(I),XP(e)
- S(f);P_PINS(H)::R1(I),XP(e)
- Refutation
- P(l);
- Try
- P(G);CHECK,XP(e)
- Vars
- Q(j);N_GUARD,P_SPINQ(j)::R1(A),XQ(j)
- Refutation
- K(d);P-FLIGHT,P_SPINQ(j)
- Try
- Actual
- Q(K);
- Threat
- QAR(K)+S(H),DCHECK
- Vars
- R(g);N_GUARD,XR(I)::P(E)
- Q(j);OGATE::R(A)+P(G),XQ(j)
- R(g);SBLOCK,S_CUTQ(j)::R(A)+P(G),XP(e)
- B(k);::QAR(K)+S(H),DCHECK,XB(k)
- S(f);N_GUARD,P_PINS(H),S_CUTR(a)::S(C),XP(b)
- S(f);P_PINS(H),S_CUTR(g)::P(E)
- S(f);P_PINS(H),S_CUTB(k)::R1(I),XP(e)
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).