MESON Chess Problem Database

Problem Display
PID: 80139 (K3N1N1/BQ3P1b/p1p2pB1/2nk4/3P1n1R/bPrPR3/7q/5r2 w - - 0 1)

Zappas, Byron

Probleme, 1965

K3N1N1/BQ3P1b/p1p2pB1/2nk4/3P1n1R/bPrPR3/7q/5r2

#2

12 + 11

5454 Near Snap 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Se2
      • 2.Se7#
    • 1...Sg2
      • 2.Se7#
    • 1...Sfxd3
      • 2.Se7#
    • 1...Sh3
      • 2.Se7#
    • 1...Sh5
      • 2.Se7#
    • 1...Sfe6
      • 2.Se7#
    • 1...Sxb3
      • 2.Sgxf6#
    • 1...Scxd3
      • 2.Sgxf6#
    • 1...Sa4
      • 2.Sgxf6#
    • 1...Sce6
      • 2.Sgxf6#
    • 1...Sxb7
      • 2.Sgxf6#
  • Tries
    • 1.Sexf6+?
      • 1...Kd6
        • 2.Bb8#
        • 2.Qe7#
        • 2.Qb8#
        • 2.f8Q#
        • 2.f8B#
      • 1...Kxd4!
    • 1.Qxc6+?
      • 1...Kxd4
        • 2.Qe4#
      • 1...Kxc6!
  • Keys
    • 1.Re6!
      • threat
        • 2.Rd6#
      • 1...Kxd4
        • 2.Qd7#
      • 1...Kxe6
        • 2.Qxc6#
      • 1...Sfxd3
        • 2.Qxc6#
      • 1...Sfxe6
        • 2.Se7#
      • 1...Sxg6
        • 2.Qxc6#
      • 1...Sxb3
        • 2.Sc7#
      • 1...Scxd3
        • 2.Sc7#
      • 1...Scxe6
        • 2.Sgxf6#
      • 1...Sxb7
        • 2.Sc7#
      • 1...Se2
        • 2.Qxc6#
      • 1...Sg2
        • 2.Qxc6#
      • 1...Sh3
        • 2.Qxc6#
      • 1...Sh5
        • 2.Qxc6#
      • 1...Sa4
        • 2.Sc7#
      • 1...Se4
        • 2.Sc7#
      • 1...Sd7
        • 2.Sc7#

Anticipated by 11559(1939)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 9
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • S(e);::S(L)
    • S(e);XP(B)::S(L)
    • S(f);XP(A)::S(L),XP(j)
    • S(f);XP(B)::S(L),XP(j)
    • S(f);::S(L),XP(j)
    • S(f);N_SPINP(i),XQ(H)::S(L),XP(j)
  • Tries
    • Try
      • S(K);CHECK,XP(j)
      • Refutation
        • K(g);N_SPINP(i),P-FLIGHT,P_SPINS(e),XP(D)
    • Try
      • Q(H);CHECK,XP(i)
      • Vars
        • K(g);OGATE,P-FLIGHT,P_SPINS(e),XP(D)::QAR1(H)
      • Refutation
        • K(g);S_FLIGHT,XQ(H)
  • Actual
    • R(C);
    • Threat
      • R1(C)
    • Vars
      • K(g);N_SPINP(i),P-FLIGHT,P_SPINS(e),XP(D)::QAR(H)
      • K(g);N_SPINP(i),S_FLIGHT,XR(C)::QAR2(H),XP(i)
      • S(e);XP(B)::QAB1(H),XP(i)
      • S(e);SBLOCK,XR(C)::S(L)
      • S(e);XB(F)::QAB1(H),XP(i)
      • S(f);XP(A)::S(K)
      • S(f);XP(B)::S(K)
      • S(f);SBLOCK,XR(C)::S(L),XP(j)
      • S(f);N_SPINP(i),XQ(H)::S(K)
      • S(e);::QAB1(H),XP(i)
      • S(f);::S(K)
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