MESON Chess Problem Database

Problem Display
PID: 18126 (N3B3/p7/r1p5/bk4p1/bBRp2r1/1N1P2n1/1K6/8 w - - 0 1)

Sprague, Gordon

The Problemist, 1953

N3B3/p7/r1p5/bk4p1/bBRp2r1/1N1P2n1/1K6/8

#2

7 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Rb6
      • 2.Sc7#
    • 1...Bb6
      • 2.Bxc6#
    • 1...Se4
      • 2.Sxd4#
  • Tries
    • 1.Rxc6?
      • threat
        • 2.Rb6#
      • 1...Kxb4
        • 2.Rc4#
      • 1...Rb6
        • 2.Rxb6#
      • 1...Bb6
        • 2.Rc4#
        • 2.Rxb6#
      • 1...Rxc6!
  • Keys
    • 1.Ka3!
      • threat
        • 2.Rc5#
      • 1...Bxb4+
        • 2.Rxb4#
      • 1...Rb6
        • 2.Sc7#
      • 1...Bb6
        • 2.Bxc6#
      • 1...Se4
        • 2.Sxd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • R(h);SBLOCK,S_CUTB(e)::S(F)
    • B(e);S_CUTR(h)::B(G),XP(i)
    • S(a);S_CUTR(d)::S(B),XP(c)
  • Tries
    • Try
      • R(E);XP(i)
      • Threat
        • B(G)+R(E),DCHECK
      • Vars
        • K(f);P-FLIGHT,XB(D)::R1(E)
        • R(h);::B(G)+R(E),DCHECK,XR(h)
      • Refutation
        • R(h);P_SPINR(h),XR(E)
  • Actual
    • K(A);S_FLIGHT
    • Threat
      • R1(E)
    • Vars
      • B(e);CHECK,OGATE,XB(D)::R1(E),XB(e)
      • R(h);SBLOCK,S_CUTB(e)::S(F)
      • B(e);S_CUTR(h)::B(G),XP(i)
      • S(a);S_CUTR(d)::S(B),XP(c)
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