MESON Chess Problem Database

Problem Display
PID: 138080 (8/p5p1/P1PNP1B1/KN1k3p/3P3B/2p3P1/2P3P1/8 w - - 0 1)

Birnov, Zinovy Markovich

4th HM., Trud, 1947

8/p5p1/P1PNP1B1/KN1k3p/3P3B/2p3P1/2P3P1/8

#2

12 + 5

14752 Soviet Chess Compositions (1945-1947) 1949
3713 Snap 2011

SOLUTION

  • SOUND
  • Sets
    • 1...Kxc6
      • 2.Be4#
    • 1...Kxe6
      • 2.Bf7#
  • Tries
    • 1.Ka4?
      • 1...Kxe6
        • 2.Bf7#
      • 1...Kxc6!
    • 1.Kb4?
      • 1...Kxe6
        • 2.Bf7#
      • 1...Kxc6!
    • 1.Sc4?
      • 1...Kxc6
        • 2.Be4#
      • 1...Kxe6
        • 2.Sc7#
      • 1...Kxc4!
    • 1.Sb7?
      • 1...Kxc6
        • 2.Be4#
      • 1...Kxe6
        • 2.Sc7#
      • 1...Kc4!
    • 1.Sf7?
      • 1...Kxc6
        • 2.Be4#
      • 1...Kxe6
        • 2.Sc7#
      • 1...Kc4!
    • 1.Sc8?
      • 1...Kxc6
        • 2.Se7#
        • 2.Be4#
      • 1...Kxe6
        • 2.Sc7#
      • 1...Kc4!
    • 1.Se8?
      • 1...Kxc6
        • 2.Be4#
      • 1...Kxe6
        • 2.Sbc7#
        • 2.Sec7#
      • 1...Kc4!
    • 1.Bg5?
      • 1...Kxc6
        • 2.Be4#
      • 1...Kxe6
        • 2.Bf7#
      • 1...h4!
    • 1.Bd8?
      • 1...Kxc6
        • 2.Be4#
      • 1...Kxe6
        • 2.Bf7#
      • 1...h4!
    • 1.g4?
      • 1...Kxc6
        • 2.Be4#
      • 1...Kxe6
        • 2.Bf7#
      • 1...hxg4!
    • 1.c7?
      • 1...Kc6
        • 2.Be4#
      • 1...Kxe6!
    • 1.e7?
      • 1...Ke6
        • 2.Bf7#
      • 1...Kxc6!
  • Keys
    • 1.Sf5!
      • 1...Kc4
        • 2.Se3#
      • 1...Ke4
        • 2.Sxc3#
      • 1...Kxc6
        • 2.Se7#
      • 1...Kxe6
        • 2.Sc7#

Anticipated by 102068(1936)

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • K(b);S_FLIGHT,XP(I)::B(L)
    • K(b);OGATEB,S_FLIGHT,XP(K)::B(L)
  • Tries
    • Try
      • K(F);P-FLIGHT
      • Vars
        • K(b);OGATEB,S_FLIGHT,XP(K)::B(L)
      • Refutation
        • K(b);S_FLIGHT,XP(I)
    • Try
      • K(F);S_FLIGHT
      • Vars
        • K(b);OGATEB,S_FLIGHT,XP(K)::B(L)
      • Refutation
        • K(b);S_FLIGHT,XP(I)
    • Try
      • S(J);
      • Vars
        • K(b);S_FLIGHT,XP(I)::B(L)
        • K(b);S_FLIGHT,XP(K)::S(G)
      • Refutation
        • K(b);S_FLIGHT,XS(J)
    • Try
      • S(J);
      • Vars
        • K(b);S_FLIGHT,XP(I)::B(L)
        • K(b);S_FLIGHT,XP(K)::S(G)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • S(J);
      • Vars
        • K(b);S_FLIGHT,XP(I)::B(L)
        • K(b);S_FLIGHT,XP(K)::S(G)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • S(J);
      • Vars
        • K(b);S_FLIGHT,XP(K)::S(G)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • S(J);
      • Vars
        • K(b);S_FLIGHT,XP(I)::B(L)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • B(E);
      • Vars
        • K(b);S_FLIGHT,XP(I)::B(L)
        • K(b);OGATEB,S_FLIGHT,XP(K)::B(L)
      • Refutation
        • P(c);
    • Try
      • B(E);
      • Vars
        • K(b);S_FLIGHT,XP(I)::B(L)
        • K(b);OGATEB,S_FLIGHT,XP(K)::B(L)
      • Refutation
        • P(c);
    • Try
      • P(C);
      • Vars
        • K(b);S_FLIGHT,XP(I)::B(L)
        • K(b);OGATEB,S_FLIGHT,XP(K)::B(L)
      • Refutation
        • P(c);XP(C)
    • Try
      • P(I);
      • Vars
        • K(b);S_FLIGHT::B(L)
      • Refutation
        • K(b);S_FLIGHT,XP(K)
    • Try
      • P(K);
      • Vars
        • K(b);S_FLIGHT::B(L)
      • Refutation
        • K(b);S_FLIGHT,XP(I)
  • Actual
    • S(J);
    • Vars
      • K(b);S_FLIGHT::S(J)
      • K(b);S_FLIGHT::S(G),XP(a)
      • K(b);S_FLIGHT,XP(I)::S(J)
      • K(b);S_FLIGHT,XP(K)::S(G)
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