MESON Chess Problem Database
Problem Display
PID: 109107 (4R3/b1Nn3r/2q1B3/3pBPQ1/R1N1k2r/5pPb/n2K4/8 w - - 0 1)
Overkamp, Petrus
BCF, 1952
#2
10 + 10
| 6490 | yacpdb | 2009 |
SOLUTION
- SOUND
- Sets
- 1...Qxa4
- 2.Bxd5#
- 1...Qxc4
- 2.Bxd5#
- 1...Qa6
- 2.Bxd5#
- 1...Qb6
- 2.Bxd5#
- 1...Rf4
- 2.Qxf4#
- 1...R4h5
- 2.Qf4#
- 1...R4h6
- 2.Qf4#
- 1...Bg4
- 2.Qf4#
- 1...Bxf5
- 2.Bxf5#
- 2.Qxf5#
- 1...Be3+
- 2.Qxe3#
- 1...Bb8
- 2.Qe3#
- 1...Sc5
- 2.Qe3#
- 1...Sxe5
- 2.Sd6#
- 1...Sb6
- 2.Qe3#
- 1...Qxa4
- Tries
- 1.Sb6+?
- 1...Qxa4
- 2.Bxd5#
- 2.Qe3#
- 1...Qc4
- 2.Bxd5#
- 2.Qe3#
- 1...Sb4
- 2.Qe3#
- 1...d4
- 2.Qe3#
- 1...Kxe5!
- 1...Qxa4
- 1.Ba1?
- threat
- 2.Sd6#
- 2.Bxd5#
- 1...Be3+
- 2.Qxe3#
- 1...Qxc4
- 2.Bxd5#
- 1...Qxe6
- 2.Sd6#
- 1...Qxc7
- 2.Sd6#
- 1...dxc4
- 2.Bd5#
- 1...f2
- 2.Bxd5#
- 1...Sb4
- 2.Bxd5#
- 1...Qd6
- 2.Sxd6#
- 2.Bxd5#
- 1...Re7
- 2.Sd6#
- 1...Bd4
- 2.Bxd5#
- 1...Se5
- 2.Sd6#
- 1...d4
- 2.Bd5#
- 1...Sc3!
- threat
- 1.Bb2?
- threat
- 2.Sd6#
- 2.Bxd5#
- 1...Be3+
- 2.Qxe3#
- 1...Qxc4
- 2.Bxd5#
- 1...Qxe6
- 2.Sd6#
- 1...Qxc7
- 2.Sd6#
- 1...dxc4
- 2.Bd5#
- 1...f2
- 2.Bxd5#
- 1...Sb4
- 2.Bxd5#
- 1...Qd6
- 2.Sxd6#
- 2.Bxd5#
- 1...Re7
- 2.Sd6#
- 1...Bd4
- 2.Bxd5#
- 1...Se5
- 2.Sd6#
- 1...d4
- 2.Bd5#
- 1...Sc3!
- threat
- 1.Bc3?
- threat
- 2.Sd6#
- 2.Bxd5#
- 1...Be3+
- 2.Qxe3#
- 1...Qxc4
- 2.Bxd5#
- 1...Qxe6
- 2.Sd6#
- 1...Qxc7
- 2.Sd6#
- 1...dxc4
- 2.Bd5#
- 1...f2
- 2.Bxd5#
- 1...Sb4
- 2.Bxd5#
- 1...Qd6
- 2.Sxd6#
- 2.Bxd5#
- 1...Re7
- 2.Sd6#
- 1...Bd4
- 2.Bxd5#
- 1...Se5
- 2.Sd6#
- 1...d4
- 2.Bd5#
- 1...Sxc3!
- threat
- 1.Bf6?
- threat
- 2.Sd6#
- 2.Bxd5#
- 1...Be3+
- 2.Qxe3#
- 1...Qxc4
- 2.Bxd5#
- 1...Qxe6
- 2.Sd6#
- 1...Qxc7
- 2.Sd6#
- 1...dxc4
- 2.Bd5#
- 1...Se5
- 2.Sd6#
- 1...f2
- 2.Bxd5#
- 1...Sb4
- 2.Bxd5#
- 1...Qd6
- 2.Sxd6#
- 2.Bxd5#
- 1...Re7
- 2.Sd6#
- 1...Bd4
- 2.Bxd5#
- 1...d4
- 2.Bd5#
- 1...Sxf6!
- threat
- 1.Qxh4+?
- 1...Bg4
- 2.Qxg4#
- 1...Rxh4!
- 1...Bg4
- 1.gxh4?
- threat
- 2.Qf4#
- 1...Be3+
- 2.Qxe3#
- 1...Sxe5
- 2.Sd6#
- 1...Rxh4!
- threat
- 1.g4?
- threat
- 2.Qf4#
- 1...Be3+
- 2.Qxe3#
- 1...Sxe5
- 2.Sd6#
- 1...Rxg4!
- threat
- 1.Sb6+?
- Keys
- 1.Bd4!
- threat
- 2.Qe3#
- 1...Kxd4
- 2.Qe3#
- 1...Qxe6
- 2.Sd6#
- 1...Bxd4
- 2.Bxd5#
- 1...Rf4
- 2.Qxf4#
- threat
- 1.Bd4!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 3
- REMOVED MATES = 12
- Sets
- Q(g);N_GUARD,XR(C)::B(H),XP(f)
- Q(g);N_GUARD,P_SPINQ(g),XS(D)::B(H),XP(f)
- Q(g);N_GUARD::B(H),XP(f)
- R(e);N_GUARD::QAR1(G),XR(e)
- R(e);N_GUARD::QAR1(G)
- B(c);S_CUTR(e)::QAR1(G)
- B(h);CHECK,N_GUARD::QAR1(G),XB(h)
- B(h);N_GUARD::QAR1(G)
- S(i);S_CUTB(h)::QAR1(G)
- S(i);SBLOCK,XB(E)::R(C)+S(D),DCHECK
- Tries
- Try
- S(D);CHECK
- Vars
- S(a);P_SPINS(a)::QAR1(G)
- P(f);P_SPINP(f)::QAR1(G)
- Refutation
- K(d);P-FLIGHT,XB(E)
- Try
- B(E);
- Threat
- DUALS(2)
- Vars
- B(h);CHECK,N_GUARD::QAR1(G),XB(h)
- Q(g);P_SPINQ(g),XS(D)::R(J)+B(H),DCHECK,XP(f)
- Q(g);P_SPINQ(g),XB(H)::R(C)+S(D),DCHECK
- Q(g);XS(I)::R(C)+S(D),DCHECK
- P(f);P_SPINP(f),XS(D)::R(J)+B(H),DCHECK
- P(b);::R(J)+B(H),DCHECK,XP(f)
- S(a);::R(J)+B(H),DCHECK,XP(f)
- R(j);::R(C)+S(D),DCHECK
- B(h);::R(J)+B(H),DCHECK,XP(f)
- S(i);::R(C)+S(D),DCHECK
- P(f);::R(J)+B(H),DCHECK
- Refutation
- S(a);
- Try
- B(E);
- Threat
- DUALS(2)
- Vars
- B(h);CHECK,N_GUARD::QAR1(G),XB(h)
- Q(g);P_SPINQ(g),XS(D)::R(J)+B(H),DCHECK,XP(f)
- Q(g);P_SPINQ(g),XB(H)::R(C)+S(D),DCHECK
- Q(g);XS(I)::R(C)+S(D),DCHECK
- P(f);P_SPINP(f),XS(D)::R(J)+B(H),DCHECK
- P(b);::R(J)+B(H),DCHECK,XP(f)
- S(a);::R(J)+B(H),DCHECK,XP(f)
- R(j);::R(C)+S(D),DCHECK
- B(h);::R(J)+B(H),DCHECK,XP(f)
- S(i);::R(C)+S(D),DCHECK
- P(f);::R(J)+B(H),DCHECK
- Refutation
- S(a);
- Try
- B(E);
- Threat
- DUALS(2)
- Vars
- B(h);CHECK,N_GUARD::QAR1(G),XB(h)
- Q(g);P_SPINQ(g),XS(D)::R(J)+B(H),DCHECK,XP(f)
- Q(g);P_SPINQ(g),XB(H)::R(C)+S(D),DCHECK
- Q(g);XS(I)::R(C)+S(D),DCHECK
- P(f);P_SPINP(f),XS(D)::R(J)+B(H),DCHECK
- P(b);::R(J)+B(H),DCHECK,XP(f)
- S(a);::R(J)+B(H),DCHECK,XP(f)
- R(j);::R(C)+S(D),DCHECK
- B(h);::R(J)+B(H),DCHECK,XP(f)
- S(i);::R(C)+S(D),DCHECK
- P(f);::R(J)+B(H),DCHECK
- Refutation
- S(a);XB(E)
- Try
- B(E);
- Threat
- DUALS(2)
- Vars
- B(h);CHECK,N_GUARD::QAR1(G),XB(h)
- Q(g);P_SPINQ(g),XS(D)::R(J)+B(H),DCHECK,XP(f)
- Q(g);P_SPINQ(g),XB(H)::R(C)+S(D),DCHECK
- Q(g);XS(I)::R(C)+S(D),DCHECK
- P(f);P_SPINP(f),XS(D)::R(J)+B(H),DCHECK
- S(i);::R(C)+S(D),DCHECK
- P(b);::R(J)+B(H),DCHECK,XP(f)
- S(a);::R(J)+B(H),DCHECK,XP(f)
- R(j);::R(C)+S(D),DCHECK
- B(h);::R(J)+B(H),DCHECK,XP(f)
- P(f);::R(J)+B(H),DCHECK
- Refutation
- S(i);XB(E)
- Try
- Q(G);CHECK,XR(e)
- Vars
- B(c);N_GUARD,P_SPINB(c)::QAR2(G),XB(c)
- Refutation
- R(j);XQ(G)
- Try
- P(B);XR(e)
- Threat
- QAR1(G)
- Vars
- B(h);CHECK,N_GUARD::QAR1(G),XB(h)
- S(i);SBLOCK,XB(E)::R(C)+S(D),DCHECK
- Refutation
- R(j);XP(B)
- Try
- P(B);
- Threat
- QAR1(G)
- Vars
- B(h);CHECK,N_GUARD::QAR1(G),XB(h)
- S(i);SBLOCK,XB(E)::R(C)+S(D),DCHECK
- Refutation
- R(e);XP(B)
- Try
- Actual
- B(E);
- Threat
- QAR1(G)
- Vars
- K(d);P-FLIGHT,XB(E)::QAB1(G)
- Q(g);N_GUARD,P_SPINQ(g),XB(H)::S(D)
- B(h);SBLOCK,XB(E)::R(J)+B(H),DCHECK,XP(f)
- R(e);N_GUARD::QAR1(G),XR(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).