MESON Chess Problem Database
Problem Display
PID: 54620 (8/8/4pPR1/Q1p5/P1Pkn3/8/2K1R1N1/5B2 w - - 0 1)
Sonnenfeld, Felix Alexander
Comm., Valadao Monteiro Ty., 1970
#2
9 + 4
| 5309 | O Mosqueteiro do Rei | 1997 |
| 5454 | Near Snap | 2007 |
SOLUTION
- SOUND
- Sets
- 1...Kxc4
- 2.Rd2#
- 1...Ke5
- 2.Qxc5#
- 1...Sd2
- 2.Qc3#
- 1...Sf2
- 2.Qc3#
- 1...Sc3
- 2.Qxc3#
- 1...Sg3
- 2.Qc3#
- 1...Sg5
- 2.Qc3#
- 1...Sd6
- 2.Qc3#
- 1...Sxf6
- 2.Qc3#
- 1...Kxc4
- Tries
- 1.Kb2?
- 1...Kd3
- 2.Rd2#
- 1...Kxc4
- 2.Rd2#
- 1...Ke5
- 2.Qxc5#
- 1...Sxf6
- 2.Qc3#
- 1...Sd2
- 2.Qc3#
- 1...Sf2
- 2.Qc3#
- 1...Sc3
- 2.Qxc3#
- 1...Sg3
- 2.Qc3#
- 1...Sg5
- 2.Qc3#
- 1...Sd6
- 2.Qc3#
- 1...e5!
- 1...Kd3
- 1.Kb3?
- 1...Sd2+
- 2.Qxd2#
- 1...Kd3
- 2.Rd2#
- 1...Ke5
- 2.Qxc5#
- 1...Sxf6
- 2.Qd2#
- 2.Qc3#
- 1...Sf2
- 2.Qc3#
- 2.Qd8#
- 1...Sc3
- 2.Qxc3#
- 1...Sg3
- 2.Qd2#
- 2.Qc3#
- 2.Qd8#
- 1...Sg5
- 2.Qd2#
- 2.Qc3#
- 2.Qd8#
- 1...Sd6
- 2.Qd2#
- 2.Qc3#
- 1...e5!
- 1...Sd2+
- 1.Re1?
- 1...Ke5
- 2.Qxc5#
- 1...Sxf6
- 2.Qd2#
- 2.Qc3#
- 1...Sd2
- 2.Qxd2#
- 2.Qc3#
- 2.Qd8#
- 1...Sf2
- 2.Qc3#
- 2.Qd8#
- 1...Sc3
- 2.Qxc3#
- 1...Sg3
- 2.Qd2#
- 2.Qc3#
- 2.Qd8#
- 1...Sg5
- 2.Qd2#
- 2.Qc3#
- 2.Qd8#
- 1...Sd6
- 2.Qd2#
- 2.Qc3#
- 1...e5!
- 1...Ke5
- 1.Re3?
- 1...Ke5
- 2.Qxc5#
- 1...Sxf6
- 2.Qd2#
- 2.Qc3#
- 1...Sd2
- 2.Qxd2#
- 2.Qc3#
- 2.Qd8#
- 1...Sf2
- 2.Qc3#
- 2.Qd8#
- 1...Sc3
- 2.Qxc3#
- 1...Sg3
- 2.Qd2#
- 2.Qc3#
- 2.Qd8#
- 1...Sg5
- 2.Qd2#
- 2.Qc3#
- 2.Qd8#
- 1...Sd6
- 2.Qd2#
- 2.Qc3#
- 1...e5!
- 1...Ke5
- 1.Rg4?
- threat
- 2.Rexe4#
- 2.Rgxe4#
- 2.Qc3#
- 1...Kxc4
- 2.Rd2#
- 1...Ke5!
- threat
- 1.Rg5?
- 1...Kxc4
- 2.Rd2#
- 2.Rxe4#
- 1...Sxg5
- 2.Qc3#
- 1...Sxf6
- 2.Qc3#
- 2.Qxc5#
- 1...Sd2
- 2.Qc3#
- 2.Qxc5#
- 1...Sf2
- 2.Qc3#
- 2.Qxc5#
- 1...Sc3
- 2.Qxc3#
- 2.Qxc5#
- 1...Sg3
- 2.Qc3#
- 2.Qxc5#
- 1...Sd6
- 2.Qc3#
- 2.Qxc5#
- 1...e5!
- 1...Kxc4
- 1.Rh6?
- 1...Kxc4
- 2.Rd2#
- 1...Ke5
- 2.Qxc5#
- 1...Sxf6
- 2.Qc3#
- 1...Sd2
- 2.Qc3#
- 1...Sf2
- 2.Qc3#
- 1...Sc3
- 2.Qxc3#
- 1...Sg3
- 2.Qc3#
- 1...Sg5
- 2.Qc3#
- 1...Sd6
- 2.Qc3#
- 1...e5!
- 1...Kxc4
- 1.f7?
- 1...Kxc4
- 2.Rd2#
- 1...Ke5
- 2.Qxc5#
- 1...Sd2
- 2.Qc3#
- 1...Sf2
- 2.Qc3#
- 1...Sc3
- 2.Qxc3#
- 1...Sg3
- 2.Qc3#
- 1...Sg5
- 2.Qc3#
- 1...Sd6
- 2.Qc3#
- 1...Sf6
- 2.Qc3#
- 1...e5!
- 1...Kxc4
- 1.Kb2?
- Keys
- 1.Qd8+!
- 1...Kxc4
- 2.Rxe4#
- 1...Ke5
- 2.Rg5#
- 1...Sd6
- 2.Rg4#
- 1...Kxc4
- 1.Qd8+!
Anticipated by 52596(1964)
FEATURES
- Static
- TYPE = CHECKING_KEY
- CHANGED MATES = 3
- ADDED MATES = 0
- REMOVED MATES = 6
- Sets
- K(a);P-FLIGHT,XP(F)::B(A)+R(C)
- K(a);P_SPINP(c),P_SPINS(b),S_FLIGHT::QAR2(G),XP(c)
- S(b);N_GUARD::QAB1(G)
- S(b);N_GUARD::QAB1(G),XS(b)
- S(b);N_GUARD,XP(H)::QAB1(G)
- Tries
- Try
- K(B);P-FLIGHT
- Vars
- K(a);P-FLIGHT::B(A)+R(C),DCHECK
- K(a);P-FLIGHT,XP(F)::B(A)+R(C)
- K(a);P_SPINP(c),P_SPINS(b),S_FLIGHT::QAR2(G),XP(c)
- S(b);N_GUARD,XP(H)::QAB1(G)
- S(b);N_GUARD::QAB1(G)
- S(b);N_GUARD::QAB1(G),XS(b)
- Refutation
- P(d);
- Try
- K(B);S_FLIGHT
- Vars
- S(b);CHECK,N_GUARD::QAR2(G),XS(b)
- K(a);P-FLIGHT::B(A)+R(C),DCHECK
- K(a);P_SPINP(c),P_SPINS(b),S_FLIGHT::QAR2(G),XP(c)
- S(b);N_GUARD::QAB1(G),XS(b)
- Refutation
- P(d);
- Try
- R(C);
- Vars
- K(a);P_SPINP(c),P_SPINS(b),S_FLIGHT::QAR2(G),XP(c)
- S(b);N_GUARD::QAB1(G),XS(b)
- Refutation
- P(d);
- Try
- R(C);
- Vars
- K(a);P_SPINP(c),P_SPINS(b),S_FLIGHT::QAR2(G),XP(c)
- S(b);N_GUARD::QAB1(G),XS(b)
- Refutation
- P(d);
- Try
- R(I);P_PINS(b)
- Threat
- DUALS(3)
- Vars
- K(a);P-FLIGHT,XP(F)::B(A)+R(C)
- Refutation
- K(a);P_SPINP(c),S_FLIGHT
- Try
- R(I);
- Vars
- S(b);N_GUARD,XR(I)::QAB1(G)
- Refutation
- P(d);
- Try
- R(I);
- Vars
- K(a);P-FLIGHT,XP(F)::B(A)+R(C)
- K(a);P_SPINP(c),P_SPINS(b),S_FLIGHT::QAR2(G),XP(c)
- S(b);N_GUARD,XP(H)::QAB1(G)
- S(b);N_GUARD::QAB1(G)
- S(b);N_GUARD::QAB1(G),XS(b)
- Refutation
- P(d);
- Try
- P(H);
- Vars
- K(a);P-FLIGHT,XP(F)::B(A)+R(C)
- K(a);P_SPINP(c),P_SPINS(b),S_FLIGHT::QAR2(G),XP(c)
- S(b);N_GUARD::QAB1(G)
- S(b);N_GUARD::QAB1(G),XS(b)
- Refutation
- P(d);
- Try
- Actual
- Q(G);CHECK
- Vars
- K(a);P-FLIGHT,XP(F)::B(A)+R(C),DCHECK,XS(b)
- K(a);P_SPINS(b),S_FLIGHT::R(I)
- S(b);P_SPINS(b)::R(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).