MESON Chess Problem Database

Problem Display
PID: 208031 (8/3n4/1q1p4/3pk1p1/1N1Npr2/2P3B1/3K4/4R2Q w - - 0 1)

Crotty, CS

Dubuque Chess Journal, 1873

8/3n4/1q1p4/3pk1p1/1N1Npr2/2P3B1/3K4/4R2Q

#2

7 + 8

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sc5
      • 2.Qh8#
    • 1...Sf6
      • 2.Sd3#
    • 1...Sb8
      • 2.Qh8#
    • 1...Sf8
      • 2.Qh8#
  • Tries
    • 1.Qh6?
      • threat
        • 2.Sd3#
        • 2.Qxg5#
        • 2.Qe6#
      • 1...e3+
        • 2.Rxe3#
      • 1...Qxb4
        • 2.Qxg5#
        • 2.Qe6#
      • 1...Qd8
        • 2.Sd3#
        • 2.Sbc6#
        • 2.Qe6#
      • 1...Qb5
        • 2.Qxg5#
        • 2.Qe6#
      • 1...Qa6
        • 2.Qxg5#
        • 2.Qe6#
      • 1...Sc5
        • 2.Qxg5#
        • 2.Qg7#
        • 2.Qh8#
      • 1...Sf6
        • 2.Sd3#
        • 2.Qxg5#
      • 1...Sf8
        • 2.Sd3#
        • 2.Qxg5#
        • 2.Qg7#
        • 2.Qh8#
      • 1...g4
        • 2.Sd3#
        • 2.Bxf4#
        • 2.Qxf4#
        • 2.Qg5#
        • 2.Qe6#
      • 1...Qxd4+!
  • Keys
    • 1.Qh8+!
      • 1...Sf6
        • 2.Sd3#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 3
  • Sets
    • S(h);N_GUARD::QAB(B)
    • S(h);SBLOCK::S(F)
  • Tries
    • Try
      • Q(B);
      • Threat
        • DUALS(3)
      • Vars
        • P(a);CHECK,OGATEB::R(A),XP(a)
      • Refutation
        • Q(f);CHECK,XS(G)
  • Actual
    • Q(B);CHECK
    • Vars
      • S(h);P_SPINS(h)::S(F)
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