MESON Chess Problem Database
Problem Display
PID: 258581 (8/PN1p2Kb/8/4pp2/1N2k1BQ/2r1P2R/3qP3/B1nR3n w - - 0 1)
Erokhin, Vladimir Alekseevich
4th Comm., Szachy, 1987
#2
11 + 9
| 15601 | Albrecht-Leiss-Degener Collection | 2022 |
SOLUTION
- SOUND
- Sets
- 1...Qe1
- 2.Sd6#
- 1...Qxe3
- 2.Bf3#
- 1...Qa2
- 2.Sd6#
- 1...Qb2
- 2.Sd6#
- 1...Qc2
- 2.Sd6#
- 1...Qxe2
- 2.Sd6#
- 1...Qd6
- 2.Sxd6#
- 1...Ra3
- 2.Sc5#
- 1...Rb3
- 2.Sc5#
- 1...Rd3
- 2.Sc5#
- 1...Rxe3
- 2.Bf3#
- 1...Rc5
- 2.Sxc5#
- 1...Sd3
- 2.Sd6#
- 1...fxg4
- 2.Qxg4#
- 2.Qxh7#
- 1...f4
- 2.Qxh7#
- 1...d5
- 2.Sd6#
- 1...Qe1
- Tries
- 1.Rf3?
- threat
- 2.Bxf5#
- 1...Qxe2
- 2.Sd6#
- 1...fxg4
- 2.Qxg4#
- 2.Qxh7#
- 1...f4
- 2.Qxh7#
- 1...Sxe2!
- threat
- 1.Qg3?
- threat
- 2.Qg2#
- 2.Qf3#
- 1...Qxe3
- 2.Sd6#
- 1...Qxe2
- 2.Sd6#
- 1...Rxe3
- 2.Sc5#
- 2.Qxe5#
- 1...fxg4
- 2.Qxg4#
- 1...f4
- 2.Qf3#
- 1...Sxg3!
- threat
- 1.Qg5?
- threat
- 2.Bf3#
- 1...Qxe3
- 2.Sd6#
- 1...Qxe2
- 2.Sd6#
- 1...Rxe3
- 2.Sc5#
- 1...fxg4
- 2.Qxg4#
- 1...f4!
- threat
- 1.Qxh7?
- threat
- 2.Bxf5#
- 2.Qxf5#
- 1...Qxe3
- 2.Qxf5#
- 1...Rxe3
- 2.Qxf5#
- 1...Sg3!
- threat
- 1.a8Q?
- threat
- 2.Sc5#
- 2.Sd6#
- 1...Qxe3
- 2.Bf3#
- 1...Rxe3
- 2.Bf3#
- 1...fxg4
- 2.Sd6#
- 2.Qxg4#
- 2.Qxh7#
- 1...Qd5
- 2.Sd6#
- 1...Qd6
- 2.Sc5#
- 2.Sxd6#
- 1...Rc5
- 2.Sxc5#
- 2.Sd6#
- 1...Rc6
- 2.Sc5#
- 1...d5
- 2.Sd6#
- 1...d6
- 2.Sc5#
- 2.Sxd6#
- 1...Sg3!
- threat
- 1.a8B?
- threat
- 2.Sc5#
- 2.Sd6#
- 1...Qxe3
- 2.Bf3#
- 1...Rxe3
- 2.Bf3#
- 1...fxg4
- 2.Sd6#
- 2.Qxg4#
- 2.Qxh7#
- 1...Qd5
- 2.Sd6#
- 1...Qd6
- 2.Sc5#
- 2.Sxd6#
- 1...Rc5
- 2.Sxc5#
- 2.Sd6#
- 1...Rc6
- 2.Sc5#
- 1...d5
- 2.Sd6#
- 1...d6
- 2.Sc5#
- 2.Sxd6#
- 1...Sg3!
- threat
- 1.Rf3?
- Keys
- 1.Qh6!
- threat
- 2.Bf3#
- 1...Qxe3
- 2.Sd6#
- 1...Qxe2
- 2.Sd6#
- 1...Rxe3
- 2.Sc5#
- 1...fxg4
- 2.Qxh7#
- 1...f4
- 2.Qxh7#
- threat
- 1.Qh6!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 2
- ADDED MATES = 1
- REMOVED MATES = 11
- Sets
- Q(c);N_GUARD::S(J)
- Q(c);SBLOCK,XP(D)::QAR(H)+B(G),DCHECK
- Q(c);N_GUARD,XP(C)::S(J)
- Q(c);N_GUARD::S(J),XQ(c)
- R(d);N_GUARD::S(J)
- R(d);SBLOCK,XP(D)::QAR(H)+B(G),DCHECK
- R(d);N_GUARD::S(J),XR(d)
- S(a);S_CUTQ(c)::S(J)
- P(g);OGATEB::QAB(H),XB(i)
- P(h);S_CUTQ(c)::S(J)
- Tries
- Try
- R(E);
- Threat
- QAR(H)+B(G),DCHECK,XP(g)
- Vars
- Q(c);N_GUARD,XP(C)::S(J)
- P(g);OGATEB::QAB(H),XB(i)
- Refutation
- S(a);XP(C)
- Try
- Q(H);
- Threat
- DUALS(2)
- Vars
- Q(c);N_GUARD,XP(D)::S(J)
- Q(c);N_GUARD,XP(C)::S(J)
- P(g);OGATE,XB(G)::QAR2(H),XP(g)
- P(g);::QAB1(H)
- Refutation
- S(b);XQ(H)
- Try
- Q(H);
- Threat
- B(G)
- Vars
- Q(c);N_GUARD,XP(D)::S(J)
- Q(c);N_GUARD,XP(C)::S(J)
- R(d);N_GUARD,XP(D)::S(J)
- P(g);OGATE,XB(G)::QAR2(H),XP(g)
- Refutation
- P(g);
- Try
- Q(H);P_PINP(g),XB(i)
- Threat
- DUALS(2)
- Vars
- Q(c);XP(D)::QAB1(H),XP(g)
- R(d);XP(D)::QAB1(H),XP(g)
- Refutation
- S(b);
- Try
- P(I);
- Threat
- DUALS(2)
- Vars
- Q(c);SBLOCK,XP(D)::QAR(H)+B(G),DCHECK
- R(d);SBLOCK,XP(D)::QAR(H)+B(G),DCHECK
- Q(c);::S(J)
- R(d);::S(J)
- P(h);::S(J)
- Refutation
- S(b);
- Try
- P(I);
- Threat
- DUALS(2)
- Vars
- Q(c);SBLOCK,XP(D)::QAR(H)+B(G),DCHECK
- R(d);SBLOCK,XP(D)::QAR(H)+B(G),DCHECK
- Q(c);::S(J)
- R(d);::S(J)
- P(h);::S(J)
- Refutation
- S(b);
- Try
- Actual
- Q(H);
- Threat
- B(G)
- Vars
- Q(c);N_GUARD,XP(D)::S(J)
- Q(c);N_GUARD,XP(C)::S(J)
- R(d);N_GUARD,XP(D)::S(J)
- P(g);OGATEB,XB(G)::QAB(H),XB(i)
- P(g);OGATEB::QAB(H),XB(i)
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