MESON Chess Problem Database

Problem Display
PID: 227311 (1Q1r1q2/PP1pB3/K2R1r2/P3kP2/1N2N1P1/3P2P1/3R4/5b1B w - - 0 1)

Erokhin, Vladimir Alekseevich

Probleemblad, 1981

1Q1r1q2/PP1pB3/K2R1r2/P3kP2/1N2N1P1/3P2P1/3R4/5b1B

#2

15 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Qe8
      • 2.Bxf6#
    • 1...Qg8
      • 2.Bxf6#
    • 1...Rxd6+
      • 2.Qxd6#
    • 1...Rf7
      • 2.Rd5#
    • 1...Bxd3+
      • 2.Sxd3#
    • 1...Bh3
      • 2.d4#
  • Tries
    • 1.Kb5?
      • threat
        • 2.Rd5#
      • 1...Bxd3+
        • 2.Sxd3#
      • 1...Rxd6
        • 2.Qxd6#
      • 1...Rxf5!
    • 1.Kb6?
      • threat
        • 2.d4#
      • 1...Rxd6+
        • 2.Qxd6#
      • 1...Bxd3
        • 2.Sxd3#
      • 1...Bg2!
    • 1.Sxf6?
      • threat
        • 2.Rd5#
      • 1...Bxd3+
        • 2.Sxd3#
      • 1...Qxf6
        • 2.Bxf6#
      • 1...Qxe7!
    • 1.Re2?
      • threat
        • 2.d4#
      • 1...Rxd6+
        • 2.Qxd6#
      • 1...Bxe2!
    • 1.Qc7?
      • threat
        • 2.Qc3#
        • 2.Qc5#
      • 1...Rxd6+
        • 2.Qxd6#
      • 1...Bxd3+
        • 2.Sxd3#
      • 1...Qf7
        • 2.Qc3#
      • 1...Qg8
        • 2.Bxf6#
        • 2.Qc3#
      • 1...Rc8!
  • Keys
    • 1.Sg5!
      • threat
        • 2.Sf3#
      • 1...Rxd6+
        • 2.Qxd6#
      • 1...Bxd3+
        • 2.Sxd3#
      • 1...Rxf5
        • 2.Rd5#
      • 1...Be2
        • 2.Rxe2#
      • 1...Bg2
        • 2.d4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 4
  • Sets
    • Q(f);N_GUARD::B(N),XR(c)
    • R(c);CHECK,OGATE,P_SPINR(c),XR(K)::QAB1(O),XR(c)
    • R(c);N_PINR(K)::QAB(O)+R(K),DCHECK
    • B(a);CHECK,XP(C)::S(E),XB(a)
    • B(a);N_PINP(C)::P(C)
  • Tries
    • Try
      • K(J);N_SPINR(K),S_FLIGHT
      • Threat
        • QAB(O)+R(K),DCHECK
      • Vars
        • B(a);CHECK,XP(C)::S(E),XB(a)
        • R(c);OGATE,P_SPINR(c),XR(K)::QAB1(O),XR(c)
      • Refutation
        • R(c);XP(I)
    • Try
      • K(J);N_SPINP(C),P-FLIGHT
      • Threat
        • P(C)
      • Vars
        • R(c);CHECK,OGATE,P_SPINR(c),XR(K)::QAB1(O),XR(c)
        • B(a);XP(C)::S(E),XB(a)
      • Refutation
        • B(a);
    • Try
      • S(F);N_SPINR(K),XR(c)
      • Threat
        • QAB(O)+R(K),DCHECK
      • Vars
        • B(a);CHECK,XP(C)::S(E),XB(a)
        • Q(f);OGATE,P_PINR(K),XS(F)::B(N),XQ(f)
      • Refutation
        • Q(f);XB(N)
    • Try
      • R(B);N_SPINP(C)
      • Threat
        • P(C)
      • Vars
        • R(c);CHECK,OGATE,P_SPINR(c),XR(K)::QAB1(O),XR(c)
      • Refutation
        • B(a);P_PINP(C),XR(B)
    • Try
      • Q(O);
      • Threat
        • DUALS(2)
      • Vars
        • R(c);CHECK,OGATE,P_SPINR(c),XR(K)::QAB1(O),XR(c)
        • B(a);CHECK,XP(C)::S(E),XB(a)
        • Q(f);::QAB(O)
      • Refutation
        • R(e);
  • Actual
    • S(F);
    • Threat
      • S(F)
    • Vars
      • R(c);CHECK,OGATE,P_SPINR(c),XR(K)::QAB1(O),XR(c)
      • B(a);CHECK,XP(C)::S(E),XB(a)
      • R(c);N_PINR(K),XP(I)::QAB(O)+R(K),DCHECK
      • B(a);N_GUARD::R(B),XB(a)
      • B(a);N_PINP(C)::P(C)
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