MESON Chess Problem Database

Problem Display
PID: 237820 (3R3q/2nN1p2/6b1/7B/3k1P2/3P4/1R6/K1Q5 w - - 0 1)

Shanshin, Valery Yurevich

Shakhmaty v SSSR, 1982

3R3q/2nN1p2/6b1/7B/3k1P2/3P4/1R6/K1Q5

#2

8 + 5

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kxd3
      • 2.Sc5#
    • 1...Kd5
      • 2.Sf8#
    • 1...Sa6
      • 2.Sf8#
    • 1...Sa8
      • 2.Sf8#
  • Tries
    • 1.Sc5+?
      • 1...Sd5
        • 2.Rb4#
      • 1...Qxd8!
    • 1.Se5+?
      • 1...Sd5
        • 2.Rb4#
      • 1...Qxd8!
    • 1.Sb6+?
      • 1...Sd5
        • 2.Rxd5#
      • 1...Qxd8!
    • 1.Sf6+?
      • 1...Sd5
        • 2.Rxd5#
      • 1...Qxd8!
    • 1.Rb4+?
      • 1...Kxd3+
        • 2.Se5#
      • 1...Kd5+!
  • Keys
    • 1.Re2!
      • threat
        • 2.Qc4#
      • 1...Kxd3+
        • 2.Se5#
      • 1...Kd5+
        • 2.Sf6#
      • 1...Bxd3
        • 2.Qc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • K(a);P-FLIGHT,P_PINR(C),XP(D)::R(H)+S(G),DCHECK
    • K(a);P-FLIGHT,P_PINR(C)::R(H)+S(G)
    • S(c);N_GUARD::R(H)+S(G)
  • Tries
    • Try
      • S(G);CHECK
      • Vars
        • S(c);P_SPINS(c)::R(C)
      • Refutation
        • Q(e);XR(H)
    • Try
      • S(G);CHECK
      • Vars
        • S(c);P_SPINS(c)::R(C)
      • Refutation
        • Q(e);XR(H)
    • Try
      • S(G);CHECK
      • Vars
        • S(c);N_GUARD,P_SPINS(c)::R1(H),XS(c)
      • Refutation
        • Q(e);XR(H)
    • Try
      • S(G);CHECK
      • Vars
        • S(c);N_GUARD,P_SPINS(c)::R1(H),XS(c)
      • Refutation
        • Q(e);XR(H)
    • Try
      • R(C);CHECK
      • Vars
        • K(a);CHECK,P-FLIGHT,XP(D)::R(H)+S(G),DCHECK
      • Refutation
        • K(a);CHECK,P-FLIGHT
  • Actual
    • R(C);
    • Threat
      • QAR1(B)
    • Vars
      • K(a);CHECK,P-FLIGHT,XP(D)::R(H)+S(G),DCHECK
      • K(a);CHECK,P-FLIGHT::R(H)+S(G),DCHECK
      • B(b);SBLOCK,XP(D)::QAB1(B)
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