MESON Chess Problem Database

Problem Display
PID: 7401 (5K2/3R4/N1kn4/3R4/8/3bp3/3NB1Q1/8 w - - 0 1)

Rosberger, Jack

StrateGems, 1999

5K2/3R4/N1kn4/3R4/8/3bp3/3NB1Q1/8

#2

7 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Bb1
      • 2.R5xd6#
    • 1...Bc2
      • 2.R5xd6#
    • 1...Be4
      • 2.R5xd6#
    • 1...Bb5
      • 2.R5xd6#
    • 1...Bf5
      • 2.R5xd6#
    • 1...Bg6
      • 2.R5xd6#
    • 1...Bh7
      • 2.R5xd6#
    • 1...Sb5
      • 2.R5d6#
  • Tries
    • 1.Rc5+?
      • 1...Kb6
        • 2.Qc6#
      • 1...Kxd7!
  • Keys
    • 1.Qg6!
      • threat
        • 2.Qxd6#
      • 1...Kxd5
        • 2.Qxd6#
      • 1...Kb6
        • 2.Qxd6#
      • 1...Kxd7
        • 2.Qe8#
      • 1...Bxg6
        • 2.R5xd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 7
  • Sets
    • B(a);::QAB(C)+R(D),DCHECK,XS(d)
    • B(a);::R1(D),XS(d)
    • S(d);SBLOCK::QAB(C)+R(D),DCHECK
  • Tries
    • Try
      • R(D);CHECK
      • Vars
        • K(c);P-FLIGHT::QAR1(C)
      • Refutation
        • K(c);S_FLIGHT,XR(F)
  • Actual
    • Q(C);P_PINS(d)
    • Threat
      • QAR1(C),XS(d)
    • Vars
      • K(c);S_FLIGHT,XR(D)::QAR1(C),XS(d)
      • K(c);P-FLIGHT::QAR2(C),XS(d)
      • K(c);OGATEB,S_FLIGHT,XR(F)::QAB1(C)
      • B(a);N_SPINS(d),XQ(C)::R1(D),XS(d)
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