MESON Chess Problem Database

Problem Display
PID: 86268 (3Q4/5p2/3n1R2/KP1k2BR/nPN1r3/1NprPP1p/B6q/8 w - - 0 1)

Loshinski, Lev Ilich

Original, 1975

3Q4/5p2/3n1R2/KP1k2BR/nPN1r3/1NprPP1p/B6q/8

#2

12 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kxc4
      • 2.Sd2#
    • 1...Rxc4
      • 2.Bf4#
  • Tries
    • 1.Sb6+?
      • 1...Ke5
        • 2.Bf4#
        • 2.Qe7#
      • 1...Sxb6!
    • 1.Bf4+?
      • 1...Kxc4
        • 2.Sd2#
      • 1...Re5!
    • 1.Rxd6+?
      • 1...Kxc4
        • 2.Sd2#
      • 1...Qxd6!
    • 1.Qxd6+?
      • 1...Kxc4
        • 2.Sd2#
      • 1...Qxd6!
    • 1.Qd7?
      • threat
        • 2.Qc6#
      • 1...Kxc4
        • 2.Sd2#
      • 1...Rxc4
        • 2.Bf4#
      • 1...Sc5!
    • 1.Qa8+?
      • 1...Kxc4
        • 2.Sd2#
      • 1...Sb7+!
    • 1.fxe4+?
      • 1...Kxc4
        • 2.Sd2#
      • 1...Kxe4!
  • Keys
    • 1.Se5!
      • threat
        • 2.Qxd6#
      • 1...Kxe5
        • 2.Bf4#
      • 1...Qxe5
        • 2.Sd4#
      • 1...Rxe5
        • 2.Sd2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • K(g);N_SPINS(h),S_FLIGHT,XS(F)::B(A)+S(B),DCHECK
    • R(f);N_GUARD,SBLOCK,XS(F)::R(J)+B(I)
  • Tries
    • Try
      • S(F);CHECK
      • Refutation
        • S(e);XS(F)
    • Try
      • B(I);CHECK
      • Vars
        • K(g);N_SPINS(h),S_FLIGHT,XS(F)::B(A)+S(B),DCHECK
      • Refutation
        • R(f);P_SPINR(f)
    • Try
      • R(K);CHECK,XS(h)
      • Vars
        • K(g);S_FLIGHT,XS(F)::B(A)+S(B),DCHECK
      • Refutation
        • Q(a);P_SPINQ(a),XR(K)
    • Try
      • Q(L);CHECK,XS(h)
      • Vars
        • K(g);S_FLIGHT,XS(F)::B(A)+S(B),DCHECK
      • Refutation
        • Q(a);XQ(L)
    • Try
      • Q(L);
      • Threat
        • QAB1(L)
      • Vars
        • K(g);N_SPINS(h),S_FLIGHT,XS(F)::B(A)+S(B),DCHECK
        • R(f);N_GUARD,SBLOCK,XS(F)::R(J)+B(I)
      • Refutation
        • S(e);
    • Try
      • Q(L);CHECK,N_PINS(h)
      • Vars
        • K(g);S_FLIGHT,XS(F)::B(A)+S(B),DCHECK
      • Refutation
        • S(h);CHECK,P_SPINS(h)
    • Try
      • P(D);CHECK,XR(f)
      • Vars
        • K(g);N_SPINS(h),S_FLIGHT,XS(F)::B(A)+S(B),DCHECK
      • Refutation
        • K(g);N_SPINS(h),S_FLIGHT,XP(D)
  • Actual
    • S(F);
    • Threat
      • QAR1(L),XS(h)
    • Vars
      • K(g);N_SPINS(h),OGATEB,P-FLIGHT,XS(F)::R(J)+B(I),DCHECK
      • Q(a);N_GUARD,SBLOCK,XS(F)::B(A)+S(B)
      • R(f);N_GUARD,SBLOCK,XS(F)::B(A)+S(B)
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