MESON Chess Problem Database

Problem Display
PID: 23707 (8/4p2N/5p2/2Q1nP1p/1B2K2k/3R2R1/4N2b/8 w - - 0 1)

Lalaue, John A

Charleston Daily Courier, 1859

(First published on Wed Aug 3 1859)

8/4p2N/5p2/2Q1nP1p/1B2K2k/3R2R1/4N2b/8

#2

8 + 6

1679 American Chess Nuts 1868

SOLUTION

  • SOUND
  • Sets
    • 1...Sg4
      • 2.Rh3#
  • Tries
    • 1.Qf2?
      • threat
        • 2.Qxh2#
      • 1...Bxg3
        • 2.Qxg3#
      • 1...Bg1
        • 2.Rxg1#
      • 1...Sg4
        • 2.Rh3#
      • 1...Sf3!
  • Keys
    • 1.Qxe5!
      • threat
        • 2.Qf4#
      • 1...Bxg3
        • 2.Qxg3#
      • 1...fxe5
        • 2.Bxe7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • S(c);SBLOCK::R1(C)
  • Tries
    • Try
      • Q(F);
      • Threat
        • QAR2(F),XB(a)
      • Vars
        • B(a);OGATE,P_SPINB(a),XR(C)::QAB1(F),XB(a)
        • B(a);N_GUARD::QAB(F)+R(C),XB(a)
        • S(c);SBLOCK::QAB(F)+R(C),DCHECK
      • Refutation
        • S(c);
  • Actual
    • Q(F);XS(c)
    • Threat
      • QAR2(F)
    • Vars
      • B(a);OGATE,XR(C)::QAB1(F),XB(a)
      • P(e);OGATEB,XQ(F)::B(D),XP(f)
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