MESON Chess Problem Database

Problem Display
PID: 155862 (6R1/8/2pp1p2/7b/4kp2/1KBNN3/8/4R3 w - - 0 1)

Lipton, Michael

Die Schwalbe, 1957

6R1/8/2pp1p2/7b/4kp2/1KBNN3/8/4R3

#2

6 + 6

23 Die Schwalbe 2015

SOLUTION

  • SOUND
  • Sets
    • 1...Bf3
      • 2.Sf2#
  • Tries
    • 1.Sc2+?
      • 1...Kxd3
        • 2.Sb4#
      • 1...Kf3
        • 2.Sd4#
      • 1...Kd5
        • 2.Scb4#
      • 1...Kf5
        • 2.Sd4#
      • 1...Be2!
    • 1.Sg2+?
      • 1...Kxd3
        • 2.Sxf4#
      • 1...Kf3
        • 2.Sh4#
      • 1...Kd5
        • 2.Sgxf4#
      • 1...Kf5
        • 2.Sh4#
      • 1...Be2!
    • 1.Sc4+?
      • 1...Kxd3
        • 2.Sb2#
      • 1...Kf3
        • 2.Sd2#
      • 1...Kd5
        • 2.Sb6#
      • 1...Kf5
        • 2.Sxd6#
      • 1...Be2!
  • Keys
    • 1.Sg4+!
      • 1...Kxd3
        • 2.Sf2#
      • 1...Kf3
        • 2.Sh2#
      • 1...Kd5
        • 2.Sxf6#
      • 1...Kf5
        • 2.Sh6#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • B(c);SBLOCK::S(D)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • K(a);S_FLIGHT,XS(D)::S(E)
        • K(a);S_FLIGHT::S(E)
      • Refutation
        • B(c);P_SPINB(c)
    • Try
      • S(E);CHECK
      • Vars
        • K(a);S_FLIGHT,XS(D)::S(E),XP(b)
        • K(a);S_FLIGHT::S(E)
        • K(a);S_FLIGHT::S(E),XP(b)
      • Refutation
        • B(c);P_SPINB(c)
    • Try
      • S(E);CHECK
      • Vars
        • K(a);S_FLIGHT,XS(D)::S(E)
        • K(a);S_FLIGHT::S(E)
        • K(a);S_FLIGHT::S(E),XP(e)
      • Refutation
        • B(c);P_SPINB(c)
  • Actual
    • S(E);CHECK
    • Vars
      • K(a);S_FLIGHT,XS(D)::S(E)
      • K(a);S_FLIGHT::S(E)
      • K(a);S_FLIGHT::S(E),XP(f)
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