MESON Chess Problem Database
Problem Display
PID: 54467 (2b1R3/n7/2p1qp2/2Q1b3/R1N1kp2/1K1N3B/2P3P1/7n w - - 0 1)
Sonnenfeld, Felix Alexander
4th HM., Guanabara Chess Club, 1977-1979
#2
9 + 9
| 1077 | Boletim da UBP | 1989 |
| 5309 | O Mosqueteiro do Rei | 1997 |
SOLUTION
- SOUND
- Sets
- 1...Qxh3
- 2.Se3#
- 2.Sd6#
- 1...Qxc4+
- 2.Rxc4#
- 1...Qg4
- 2.Se3#
- 2.Sd6#
- 1...Qf5
- 2.Scb2#
- 2.Sd2#
- 2.Sa3#
- 2.Se3#
- 2.Sa5#
- 2.Scxe5#
- 2.Sb6#
- 2.Sd6#
- 1...Qd7
- 2.Sd2#
- 2.Sd6#
- 1...Qd6
- 2.Sd2#
- 2.Sxd6#
- 1...Qe7
- 2.Sd2#
- 2.Scxe5#
- 2.Sd6#
- 1...Qxe8
- 2.Sd2#
- 2.Scxe5#
- 2.Sd6#
- 1...Ba1
- 2.Bf5#
- 1...Bb2
- 2.Bf5#
- 1...Bc3
- 2.Bf5#
- 1...Bd4
- 2.Bf5#
- 2.Qf5#
- 1...Bd6
- 2.Bf5#
- 1...Bc7
- 2.Bf5#
- 1...Bb8
- 2.Bf5#
- 1...Sf2
- 2.Sxf2#
- 1...Sg3
- 2.Sf2#
- 1...Qxh3
- Tries
- 1.Ka3?
- threat
- 2.Sd2#
- 2.Sd6#
- 1...Bb2+
- 2.Scxb2#
- 1...Qxh3
- 2.Se3#
- 2.Sd6#
- 1...Qxc4
- 2.Rxc4#
- 1...Qg4
- 2.Se3#
- 2.Sd6#
- 1...Qd6
- 2.Sd2#
- 2.Sxd6#
- 1...Bd4
- 2.Bf5#
- 2.Qf5#
- 1...Bd6
- 2.Scb2#
- 2.Sd2#
- 2.Se3#
- 2.Sa5#
- 2.Sb6#
- 2.Sxd6#
- 2.Bf5#
- 1...Sb5+!
- threat
- 1.Bf5+?
- 1...Qxf5
- 2.Scb2#
- 2.Sd2#
- 2.Sa3#
- 2.Se3#
- 2.Sa5#
- 2.Scxe5#
- 2.Sb6#
- 2.Sd6#
- 1...Kxf5!
- 1...Qxf5
- 1.Bxe6?
- threat
- 2.Sd2#
- 2.Scxe5#
- 2.Sd6#
- 1...Ba1
- 2.Scb2#
- 2.Sd2#
- 2.Sd6#
- 2.Bf5#
- 1...Bb2
- 2.Scxb2#
- 2.Sd2#
- 2.Sd6#
- 2.Bf5#
- 1...Bc3
- 2.Sd2#
- 2.Sd6#
- 2.Bf5#
- 1...Bd4
- 2.Bf5#
- 2.Qf5#
- 1...Bd6
- 2.Scb2#
- 2.Sd2#
- 2.Sa3#
- 2.Se3#
- 2.Sa5#
- 2.Sce5#
- 2.Sb6#
- 2.Sxd6#
- 2.Bf5#
- 1...Bc7
- 2.Scb2#
- 2.Sd2#
- 2.Sa3#
- 2.Se3#
- 2.Sa5#
- 2.Sce5#
- 2.Sb6#
- 2.Sd6#
- 2.Bf5#
- 1...Bb8
- 2.Scb2#
- 2.Sd2#
- 2.Sa3#
- 2.Se3#
- 2.Sa5#
- 2.Sce5#
- 2.Sb6#
- 2.Sd6#
- 2.Bf5#
- 1...Ba6
- 2.Sd2#
- 2.Sd6#
- 1...Sb5
- 2.Sd2#
- 2.Sd6#
- 1...Bxe6!
- threat
- 1.Ra1?
- threat
- 2.Re1#
- 1...Qxh3
- 2.Sd6#
- 1...Bxa1
- 2.Bf5#
- 1...Qg4
- 2.Sd6#
- 1...Bc3
- 2.Bf5#
- 1...Bd4
- 2.Bf5#
- 2.Qf5#
- 1...Sg3
- 2.Sf2#
- 1...Qxc4+!
- threat
- 1.Rxe6?
- threat
- 2.Scb2#
- 2.Sd2#
- 2.Sa3#
- 2.Se3#
- 2.Sa5#
- 2.Scxe5#
- 2.Sb6#
- 2.Sd6#
- 1...Ba6
- 2.Sd2#
- 2.Sd6#
- 1...Sb5
- 2.Sd2#
- 2.Sd6#
- 1...Bxe6!
- threat
- 1.Qe3+?
- 1...Kd5
- 2.Sb4#
- 1...fxe3!
- 1...Kd5
- 1.Ka3?
- Keys
- 1.Sxf4!
- threat
- 2.Qe3#
- 1...Qxh3+
- 2.Se3#
- 1...Qxc4+
- 2.Rxc4#
- 1...Kxf4
- 2.Qe3#
- 1...Bxf4
- 2.Bf5#
- 1...Qg4
- 2.Se3#
- 2.Sd6#
- 1...Bd4
- 2.Qf5#
- threat
- 1.Sxf4!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 4
- REMOVED MATES = 8
- Sets
- Q(f);CHECK,OGATE,P_SPINB(d),P_SPINQ(f),XS(G)::R(F),XQ(f)
- B(d);P_SPINQ(f)::B(E)
- S(a);N_GUARD::S(D),XS(a)
- S(a);N_GUARD::S(D)
- Tries
- Try
- K(C);N_SPINS(G),P-FLIGHT
- Threat
- DUALS(2)
- Vars
- B(d);CHECK,N_GUARD,P_SPINQ(f)::R(F)+S(G),XB(d)
- Q(f);OGATE,P_SPINB(d),P_SPINQ(f),XS(G)::R(F),XQ(f)
- Refutation
- S(h);CHECK
- Try
- B(E);CHECK
- Refutation
- K(b);P_SPINB(d),S_FLIGHT,XB(E)
- Try
- B(E);N_SPINS(G),XQ(f)
- Threat
- DUALS(3)
- Refutation
- B(i);P_PINS(G),XB(E)
- Try
- R(F);
- Threat
- R(F)
- Vars
- Q(f);N_PINS(G),P_PINS(D),P_SPINB(d),XB(E)::S(G)
- B(d);P_SPINQ(f),XR(F)::B(E)
- Q(f);N_PINS(G),P_SPINB(d)::S(G)
- B(d);P_SPINQ(f)::B(E)
- S(a);N_GUARD::S(D)
- Refutation
- Q(f);CHECK,P_SPINB(d),XS(G)
- Try
- R(I);N_SPINS(G),P_PINB(d),XQ(f)
- Threat
- DUALS(8)
- Refutation
- B(i);N_SPINB(d),P_PINS(G),XR(I)
- Try
- Q(H);CHECK
- Vars
- K(b);N_PINS(G),S_FLIGHT::S(D)
- Refutation
- P(c);XQ(H)
- Try
- Actual
- S(D);XP(c)
- Threat
- QAR1(H)
- Vars
- Q(f);CHECK,N_PINS(G),P_SPINB(d),XB(E)::R(F)+S(G)
- Q(f);CHECK,OGATE,P_SPINB(d),P_SPINQ(f),XS(G)::R(F),XQ(f)
- K(b);P-FLIGHT,XS(D)::QAB1(H)
- B(d);P_SPINQ(f),SBLOCK,XS(D)::B(E)
- B(d);OGATE,P_SPINQ(f),SBLOCK::QAB1(H)
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