MESON Chess Problem Database

Problem Display
PID: 42260 (3K4/2pb1Q1p/Bp6/q4N2/4k1pr/R4NP1/3b4/B2n4 w - - 0 1)

Zappas, Byron

Probleemblad, 1988

3K4/2pb1Q1p/Bp6/q4N2/4k1pr/R4NP1/3b4/B2n4

#2

8 + 10

3335 Cyclone 2000

SOLUTION

  • SOUND
  • Sets
    • 1...Qxa3
      • 2.Sxd2#
    • 1...Qa4
      • 2.Sxd2#
    • 1...Qb5
      • 2.Sxd2#
    • 1...Qc5
      • 2.Sxd2#
    • 1...Qe5
      • 2.Sxd2#
    • 1...Qxf5
      • 2.Sxd2#
      • 2.Qc4#
    • 1...Qxa6
      • 2.Sxd2#
    • 1...Be1
      • 2.Sg5#
    • 1...Bb4
      • 2.Sg5#
    • 1...Bg5+
      • 2.Sxg5#
    • 1...Bb5
      • 2.Qe6#
    • 1...Bxf5
      • 2.Qc4#
    • 1...Se3
      • 2.Sg5#
    • 1...gxf3
      • 2.Bd3#
    • 1...c5
      • 2.Sd6#
    • 1...c6
      • 2.Sd6#
  • Tries
    • 1.Bb7+?
      • 1...Qd5
        • 2.Sxd2#
        • 2.Bxd5#
        • 2.Qxd5#
      • 1...c6
        • 2.Sd6#
      • 1...Bc6!
    • 1.Re3+?
      • 1...Sxe3
        • 2.Sg5#
      • 1...Bxe3!
    • 1.Qe6+?
      • 1...Qe5
        • 2.Sxd2#
        • 2.Qxe5#
      • 1...Bxe6!
  • Keys
    • 1.Se3!
      • threat
        • 2.Qf4#
      • 1...Qg5+
        • 2.Sxg5#
      • 1...Bxe3
        • 2.Bd3#
      • 1...Sxe3
        • 2.Bd3#
      • 1...gxf3
        • 2.Qc4#
      • 1...Qf5
        • 2.Sxd2#
      • 1...Bf5
        • 2.Sg5#
      • 1...Qe5
        • 2.Sxd2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 3
    • REMOVED MATES = 11
  • Sets
    • Q(f);N_GUARD,XR(B)::S(C),XB(b)
    • Q(f);N_GUARD::S(C),XB(b)
    • Q(f);N_GUARD,XB(F)::S(C),XB(b)
    • B(b);N_GUARD::S(C)
    • B(b);CHECK,N_GUARD::S(C),XB(b)
    • B(i);N_GUARD,S_CUTQ(f)::QAR2(G)
    • B(i);SBLOCK,XS(E)::QAR2(G)
    • S(a);S_CUTB(b)::S(C)
    • P(d);SBLOCK,XS(C)::B(F)
    • P(h);N_GUARD::S(E)
  • Tries
    • Try
      • B(F);CHECK
      • Vars
        • P(h);P_SPINP(h)::S(E)
      • Refutation
        • B(i);P_SPINB(i)
    • Try
      • R(B);CHECK
      • Vars
        • S(a);XR(B)::S(C)
      • Refutation
        • B(b);XR(B)
    • Try
      • Q(G);CHECK
      • Refutation
        • B(i);XQ(G)
  • Actual
    • S(E);
    • Threat
      • QAR1(G)
    • Vars
      • Q(f);CHECK,N_GUARD::S(C),XQ(f)
      • B(b);SBLOCK,XS(E)::B(F)
      • S(a);SBLOCK,XS(E)::B(F)
      • P(d);SBLOCK,XS(C)::QAR2(G)
      • Q(f);N_GUARD::S(C),XB(b)
      • B(i);S_CUTQ(f)::S(C)
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