MESON Chess Problem Database

Problem Display
PID: 261045 (1r1R4/2pp1P1Q/2Pn4/4p1N1/1PpkP3/2p5/2Bn2N1/R6K w - - 0 1)

Mochalkin, Oleksandr Viktorovich

4th Prize, Buletin Problemistic, 1993

1r1R4/2pp1P1Q/2Pn4/4p1N1/1PpkP3/2p5/2Bn2N1/R6K

#2

11 + 9

15601 Albrecht-Leiss-Degener Collection 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Sb1
      • 2.Sf3#
    • 1...Sf1
      • 2.Sf3#
    • 1...Sb3
      • 2.Sf3#
    • 1...Sf3
      • 2.Sxf3#
    • 1...Sb5
      • 2.Se6#
    • 1...Sf5
      • 2.Se6#
    • 1...Sb7
      • 2.Se6#
    • 1...Sxf7
      • 2.Se6#
    • 1...Sc8
      • 2.Se6#
    • 1...Se8
      • 2.Se6#
    • 1...dxc6
      • 2.Se6#
  • Tries
    • 1.Rd1?
      • threat
        • 2.Sf3#
      • 1...Sxe4
        • 2.Qxe4#
      • 1...Rxb4!
    • 1.Ra5?
      • threat
        • 2.Rd5#
      • 1...S2xe4
        • 2.Sf3#
      • 1...S6xe4
        • 2.Se6#
      • 1...dxc6
        • 2.Se6#
      • 1...Sb5
        • 2.Se6#
      • 1...Rb5!
    • 1.Rxd7?
      • threat
        • 2.Se6#
      • 1...Sxe4
        • 2.Qxe4#
      • 1...Re8!
  • Keys
    • 1.Qh4!
      • threat
        • 2.Qf2#
      • 1...S2xe4
        • 2.Rd1#
      • 1...S6xe4
        • 2.Rxd7#
      • 1...Sf1
        • 2.Sf3#
      • 1...Sf5
        • 2.Se6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 9
  • Sets
    • S(a);N_GUARD::S(G)
    • S(a);N_GUARD::S(G),XS(a)
    • S(f);P_SPINP(h)::S(G)
    • S(f);P_SPINP(h),XP(I)::S(G)
    • P(h);N_GUARD,P_SPINS(f),XP(H)::S(G)
  • Tries
    • Try
      • R(A);P_PINS(a)
      • Threat
        • S(G)
      • Vars
        • S(f);OGATE,P_SPINP(h),XP(F)::QAR1(J),XS(f)
      • Refutation
        • R(i);XP(E)
    • Try
      • R(A);
      • Threat
        • R1(A)
      • Vars
        • S(a);N_GUARD,XP(F)::S(G)
        • S(f);P_SPINP(h),XP(F)::S(G)
        • P(h);N_GUARD,P_SPINS(f),XP(H)::S(G)
        • S(f);P_SPINP(h)::S(G)
      • Refutation
        • R(i);
    • Try
      • R(K);P_PINS(f),XP(h)
      • Threat
        • S(G)
      • Vars
        • S(a);OGATE,XP(F)::QAR1(J),XS(a)
      • Refutation
        • R(i);
  • Actual
    • Q(J);
    • Threat
      • QAB(J)
    • Vars
      • S(a);OGATEB,P_SPINS(a),XP(F)::R(A)
      • S(f);OGATEB,P_SPINP(h),P_SPINS(f),XP(F)::R(K),XP(h)
      • S(a);N_GUARD::S(G)
      • S(f);P_SPINP(h)::S(G)
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