MESON Chess Problem Database

Problem Display
PID: 18938 (7Q/3r1p2/3p1r1p/5k2/5N1K/b1N2BP1/4p3/5R2 w - - 0 1)

Birbrager, Isaak S

1st Prize, Revista de Sah, 1959

7Q/3r1p2/3p1r1p/5k2/5N1K/b1N2BP1/4p3/5R2

#2

7 + 8

3147 Chess Problems: Introduction to an Art 1963
56 The Problemist 2012

SOLUTION

  • SOUND
  • Sets
    • 1...Re6
      • 2.Bg4#
    • 1...Rg6
      • 2.Be4#
    • 1...h5
      • 2.Qxh5#
  • Tries
    • 1.Scd5?
      • threat
        • 2.Qxf6#
      • 1...Ke5
        • 2.Qxf6#
      • 1...Re6
        • 2.g4#
      • 1...Rg6
        • 2.Se3#
      • 1...Bb2!
    • 1.Sh5?
      • threat
        • 2.Qxf6#
      • 1...Ke5
        • 2.Qxf6#
      • 1...Ke6
        • 2.Qxf6#
      • 1...Re6
        • 2.Be4#
      • 1...Rg6
        • 2.Bg4#
      • 1...Kg6!
    • 1.Qh7+?
      • 1...Ke5
        • 2.Qe4#
      • 1...Rg6!
  • Keys
    • 1.Sfd5!
      • threat
        • 2.Qxf6#
      • 1...Ke5
        • 2.Qxf6#
      • 1...Ke6
        • 2.Qxf6#
      • 1...Kg6
        • 2.Bh5#
      • 1...Re6
        • 2.Be4#
      • 1...Rg6
        • 2.Bg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • R(e);::B(C)
    • P(f);OGATE::QAR2(G),XP(f)
  • Tries
    • Try
      • S(B);
      • Threat
        • QAR1(G),XR(e)
      • Vars
        • K(c);P-FLIGHT,P_SPINR(e)::QAB1(G),XR(e)
        • R(e);::P(D)
        • R(e);::S(B)
      • Refutation
        • B(b);
    • Try
      • S(E);
      • Threat
        • QAR1(G),XR(e)
      • Vars
        • K(c);P-FLIGHT,P_SPINR(e)::QAB1(G),XR(e)
        • K(c);S_FLIGHT::QAR1(G),XR(e)
        • R(e);SBLOCK::R(A)+B(C),DCHECK
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(G);CHECK
      • Vars
        • K(c);OGATE,P-FLIGHT::QAR1(G)
      • Refutation
        • R(e);P_SPINR(e)
  • Actual
    • S(E);
    • Threat
      • QAR1(G),XR(e)
    • Vars
      • K(c);P-FLIGHT,P_SPINR(e)::QAB1(G),XR(e)
      • K(c);S_FLIGHT::QAR1(G),XR(e)
      • K(c);S_FLIGHT::B(C)
      • R(e);SBLOCK::R(A)+B(C),DCHECK
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