MESON Chess Problem Database

Problem Display
PID: 277835 (4nr1q/5Q2/8/4B3/2ppk1B1/KR1n2br/2P2pN1/8 w - - 0 1)

Zappas, Byron

2/3 Prize, To Mat, 1962

4nr1q/5Q2/8/4B3/2ppk1B1/KR1n2br/2P2pN1/8

#2

7 + 10

15601 Albrecht-Leiss-Degener Collection 2024

SOLUTION

  • SOUND
  • Sets
    • 1...Kxe5
      • 2.Qe6#
    • 1...Qxe5
      • 2.Bf3#
    • 1...Bxe5
      • 2.Qb7#
    • 1...Sxe5
      • 2.Bf5#
  • Tries
    • 1.Bf5+?
      • 1...Kxe5
        • 2.Qe6#
      • 1...Kf3!
    • 1.cxd3+?
      • 1...Kxe5
        • 2.Qe6#
      • 1...cxd3!
  • Keys
    • 1.Qxc4!
      • threat
        • 2.Qxd4#
      • 1...Kxe5
        • 2.Qe6#
      • 1...Qxe5
        • 2.cxd3#
      • 1...Bxe5
        • 2.Qc6#
      • 1...Sxe5
        • 2.Re3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • K(g);OGATEB,P-FLIGHT,XB(F)::QAR1(G)
    • Q(j);SBLOCK,XB(F)::B(E)
    • B(c);SBLOCK,XB(F)::QAB(G)
    • S(b);SBLOCK,XB(F)::B(E)
  • Tries
    • Try
      • B(E);CHECK
      • Vars
        • K(g);N_GUARD,P-FLIGHT,S_CUTR(i),XB(F)::QAR1(G)
      • Refutation
        • K(g);P_SPINS(b),S_FLIGHT
    • Try
      • P(A);CHECK,XS(b)
      • Vars
        • K(g);P-FLIGHT,S_CUTP(e),XB(F)::QAR1(G)
      • Refutation
        • P(e);XP(A)
  • Actual
    • Q(G);P_PINP(f),XP(e)
    • Threat
      • QAR1(G),XP(f)
    • Vars
      • K(g);N_SPINP(f),OGATEB,P-FLIGHT,XB(F)::QAR1(G)
      • Q(j);SBLOCK,XB(F)::P(A),XS(b)
      • B(c);SBLOCK,XB(F)::QAB(G)
      • S(b);OGATE,SBLOCK,XB(F)::R1(D)
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