MESON Chess Problem Database

Problem Display
PID: 43621 (8/6p1/7b/4B2P/2p1K1B1/1bN1N2Q/2pkp3/R2q2R1 w - - 0 1)

Birnov, Zinovy Markovich

De Problemist, 1930

8/6p1/7b/4B2P/2p1K1B1/1bN1N2Q/2pkp3/R2q2R1

#2

9 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Ba4
      • 2.Sxc4#
    • 1...Bxe3
      • 2.Qxe3#
    • 1...c1S
      • 2.Sb1#
    • 1...c1B
      • 2.Sb1#
    • 1...e1S
      • 2.Sf1#
    • 1...e1B
      • 2.Sf1#
  • Tries
    • 1.Kd4?
      • threat
        • 2.Se4#
      • 1...Bxe3+
        • 2.Qxe3#
      • 1...Qxa1!
    • 1.Bf3?
      • threat
        • 2.Qd7#
      • 1...c1S
        • 2.Sb1#
      • 1...e1S
        • 2.Sf1#
      • 1...Ba4
        • 2.Sxc4#
      • 1...Bxe3!
  • Keys
    • 1.Bc8!
      • threat
        • 2.Qd7#
      • 1...Bxe3
        • 2.Qxe3#
      • 1...c1S
        • 2.Sb1#
      • 1...e1S
        • 2.Sf1#
      • 1...Ba4
        • 2.Sxc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 2
  • Sets
    • B(e);N_GUARD::S(D),XP(f)
    • B(g);OGATE,XS(D)::QAB1(E),XB(g)
    • P(b);N_GUARD,SBLOCK,S_CUTQ(a)::S(C)
    • P(d);N_GUARD,SBLOCK,S_CUTQ(a)::S(D)
  • Tries
    • Try
      • K(F);P-FLIGHT
      • Threat
        • S(C)
      • Vars
        • B(g);CHECK,OGATE,XS(D)::QAB1(E),XB(g)
      • Refutation
        • Q(a);P_PINS(C),XR(A)
    • Try
      • B(G);
      • Threat
        • QAR(E)
      • Vars
        • P(b);N_GUARD,SBLOCK,S_CUTQ(a)::S(C)
        • P(d);N_GUARD,SBLOCK,S_CUTQ(a)::S(D)
        • B(e);N_GUARD::S(D),XP(f)
      • Refutation
        • B(g);XS(D)
  • Actual
    • B(G);
    • Threat
      • QAR(E)
    • Vars
      • B(g);OGATE,XS(D)::QAB1(E),XB(g)
      • P(b);N_GUARD,SBLOCK,S_CUTQ(a)::S(C)
      • P(d);N_GUARD,SBLOCK,S_CUTQ(a)::S(D)
      • B(e);N_GUARD::S(D),XP(f)
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