MESON Chess Problem Database

Problem Display
PID: 18942 (7q/N3p1B1/2Pkr3/Q2N2p1/2P1n2p/b1p1R3/8/4K3 w - - 0 1)

Zappas, Byron

1st Prize, Schach, 1959

7q/N3p1B1/2Pkr3/Q2N2p1/2P1n2p/b1p1R3/8/4K3

#2

8 + 9

3749 FIDE Album (1959-1961) 1966
5862 An ABC of Chess Problems 1970
4640 Chess Wizardry: The New ABC of Chess Problems 1996
56 The Problemist 2008

SOLUTION

  • SOUND
  • Sets
    • 1...Bc5
      • 2.Qc7#
    • 1...Sd2
      • 2.Qxa3#
    • 1...Sf2
      • 2.Qxa3#
    • 1...Sg3
      • 2.Qxa3#
    • 1...Sc5
      • 2.Qc7#
    • 1...Sf6
      • 2.Qxa3#
  • Tries
    • 1.Sb4?
      • threat
        • 2.Rd3#
      • 1...Qxg7
        • 2.Sc8#
      • 1...Re5
        • 2.Qxe5#
      • 1...Rg6
        • 2.Qe5#
      • 1...Rh6
        • 2.Qe5#
      • 1...Sd2
        • 2.c5#
      • 1...Sf2
        • 2.c5#
      • 1...Sg3
        • 2.c5#
      • 1...Sc5
        • 2.Sb5#
      • 1...Sf6
        • 2.c5#
      • 1...Rf6!
    • 1.Sb5+?
      • 1...Kxc6
        • 2.Qc7#
      • 1...Kc5!
    • 1.Sc8+?
      • 1...Kxc6
        • 2.Qc7#
        • 2.Qb5#
      • 1...Qxc8!
  • Keys
    • 1.Sc7!
      • threat
        • 2.Rd3#
      • 1...Qxg7
        • 2.Se8#
      • 1...Re5
        • 2.Qxe5#
      • 1...Bc5
        • 2.Scb5#
      • 1...Sd2
        • 2.Rxe6#
      • 1...Sf2
        • 2.Rxe6#
      • 1...Sg3
        • 2.Rxe6#
      • 1...Sc5
        • 2.Scb5#
      • 1...Sf6
        • 2.Rxe6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 6
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • B(a);SBLOCK::QAB1(D)
    • S(c);N_GUARD,P_PINR(B)::QAB(D),XB(a)
    • S(c);P_PINR(B),SBLOCK::QAB1(D)
  • Tries
    • Try
      • S(E);
      • Threat
        • R(B)
      • Vars
        • Q(i);N_GUARD,XB(H)::S(G)
        • R(g);N_GUARD::QAB1(D),XR(g)
        • R(g);N_GUARD::QAB1(D)
        • S(c);N_GUARD,P_PINR(B)::P(C)
        • S(c);P_PINR(B),SBLOCK::S(G)
      • Refutation
        • R(g);
    • Try
      • S(G);CHECK
      • Vars
        • K(f);P-FLIGHT,XP(F)::QAR1(D)
      • Refutation
        • K(f);S_FLIGHT
    • Try
      • S(G);CHECK
      • Refutation
        • Q(i);XS(G)
  • Actual
    • S(E);
    • Threat
      • R(B)
    • Vars
      • Q(i);N_GUARD,XB(H)::S(E)
      • R(g);N_GUARD::QAB1(D),XR(g)
      • B(a);SBLOCK::S(E)
      • S(c);OGATE,P_PINR(B)::R1(B),XR(g)
      • S(c);P_PINR(B),SBLOCK::S(E)
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