MESON Chess Problem Database

Problem Display
PID: 137295 (7b/Kp4QB/3pp3/4PrN1/R1Pk1pp1/R7/4r3/N3B3 w - - 0 1)

Ellerman, Arnoldo

Problem (Zagreb), 1957

7b/Kp4QB/3pp3/4PrN1/R1Pk1pp1/R7/4r3/N3B3

#2

10 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Rf2
      • 2.Bxf2#
    • 1...Re4
      • 2.Sxe6#
    • 1...Rexe5
      • 2.Bf2#
    • 1...Rfxe5
      • 2.Sxe6#
    • 1...Rf7
      • 2.Sxe6#
    • 1...Rf8
      • 2.Sxe6#
  • Tries
    • 1.Sc2+?
      • 1...Kc5
        • 2.Qc7#
      • 1...Rxc2!
    • 1.Rd3+?
      • 1...Kc5
        • 2.Qc7#
      • 1...Kxd3!
  • Keys
    • 1.Qc7!
      • threat
        • 2.Qxd6#
      • 1...Kxe5
        • 2.Bc3#
      • 1...Rexe5
        • 2.Sc2#
      • 1...Rfxe5
        • 2.Rd3#
      • 1...Bxe5
        • 2.Qb6#
      • 1...dxe5
        • 2.Qb6#
        • 2.Qd6#
      • 1...d5
        • 2.c5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 4
  • Sets
    • R(a);N_GUARD::B(B),XR(a)
    • R(a);SBLOCK::S(G),XP(g)
    • R(a);N_GUARD,P_SPINR(a),XP(F)::B(B)
    • R(e);P_SPINR(e),XP(F)::S(G),XP(g)
    • R(e);::S(G),XP(g)
  • Tries
    • Try
      • S(A);CHECK
      • Vars
        • K(b);S_FLIGHT::QAR2(I)
      • Refutation
        • R(a);XS(A)
    • Try
      • R(C);CHECK
      • Vars
        • K(b);S_FLIGHT::QAR2(I)
      • Refutation
        • K(b);P-FLIGHT,P_SPINR(e),XR(C)
  • Actual
    • Q(I);
    • Threat
      • QAR2(I),XP(f)
    • Vars
      • K(b);P_SPINP(f),S_FLIGHT,XP(F)::B(B)
      • R(a);N_GUARD,SBLOCK,XP(F)::S(A)
      • R(e);SBLOCK,XP(F)::R1(C)
      • B(i);SBLOCK,XP(F)::QAB(I)
      • P(f);SBLOCK::R(D)+P(E)
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