MESON Chess Problem Database

Problem Display
PID: 259072 (7Q/N7/3p3R/B1kB4/3R2p1/2n1b3/2K5/8 w - - 0 1)

Mochalkin, Oleksandr Viktorovich

1st Prize, Buletin Problemistic, 1988

7Q/N7/3p3R/B1kB4/3R2p1/2n1b3/2K5/8

#2

7 + 5

15601 Albrecht-Leiss-Degener Collection 2022

SOLUTION

  • SOUND
  • Tries
    • 1.Kxc3?
      • threat
        • 2.Qc8#
      • 1...Bxd4+
        • 2.Qxd4#
      • 1...Bd2+!
    • 1.Kd3?
      • threat
        • 2.Qc8#
      • 1...Bxd4
        • 2.Qxd4#
      • 1...Sxd5
        • 2.Rc4#
      • 1...Sb5!
    • 1.Bf7?
      • threat
        • 2.Rc4#
      • 1...Bxd4
        • 2.Qc8#
      • 1...d5
        • 2.Bb4#
        • 2.Bb6#
        • 2.Rc6#
      • 1...Sd5!
    • 1.Rh5?
      • threat
        • 2.Rc4#
      • 1...Bxd4
        • 2.Qc8#
      • 1...Sxd5
        • 2.Rhxd5#
      • 1...Bg5!
    • 1.Qa8?
      • threat
        • 2.Rc4#
      • 1...Bxd4
        • 2.Qc6#
      • 1...Sxd5
        • 2.Qxd5#
      • 1...Kxd4!
  • Keys
    • 1.Qe5!
      • threat
        • 2.Rc4#
      • 1...Bxd4
        • 2.Qxd6#
      • 1...Sxd5
        • 2.Qxd5#
      • 1...dxe5
        • 2.Bb6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • K(A);P-FLIGHT,XS(a)
      • Threat
        • QAR(G)
      • Vars
        • B(b);CHECK,OGATE,XR(B)::QAB1(G),XB(b)
      • Refutation
        • B(b);CHECK
    • Try
      • K(A);S_FLIGHT
      • Threat
        • QAR(G)
      • Vars
        • B(b);OGATE,XR(B)::QAB1(G),XB(b)
        • S(a);SBLOCK,XB(D)::R1(B)
      • Refutation
        • S(a);
    • Try
      • B(D);
      • Threat
        • R1(B)
      • Vars
        • B(b);SBLOCK,XR(B)::QAR(G)
      • Refutation
        • S(a);
    • Try
      • R(E);
      • Threat
        • R1(B)
      • Vars
        • B(b);SBLOCK,XR(B)::QAR(G)
        • S(a);OGATE,P_SPINS(a),XB(D)::R1(E),XS(a)
      • Refutation
        • B(b);
    • Try
      • Q(G);
      • Threat
        • R1(B)
      • Vars
        • B(b);SBLOCK,XR(B)::QAR1(G)
        • S(a);OGATE,XB(D)::QAR1(G),XS(a)
      • Refutation
        • K(d);S_FLIGHT,XR(B)
  • Actual
    • Q(G);
    • Threat
      • R1(B)
    • Vars
      • B(b);SBLOCK,XR(B)::QAB1(G),XP(e)
      • S(a);OGATE,P_SPINS(a),XB(D)::QAR1(G),XS(a)
      • P(e);XQ(G)::B(C)
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