MESON Chess Problem Database

Problem Display
PID: 230682 (8/7B/5Q2/6p1/6k1/8/5K2/8 w - - 0 1)

Gray, Henry

The Field, 1898

(First published on Sat Mar 26 1898)

8/7B/5Q2/6p1/6k1/8/5K2/8

#2

3 + 2

5454 Near Snap 2021
3713 Snap 2021
15239 Valois Notebooks 2021

SOLUTION

  • SOUND
  • Tries
    • 1.Bf5+?
      • 1...Kh4
        • 2.Qh8#
        • 2.Qh6#
      • 1...Kh5
        • 2.Qh8#
      • 1...Kf4!
    • 1.Qc3?
      • 1...Kf4
        • 2.Qd4#
        • 2.Qg3#
      • 1...Kh5
        • 2.Qh3#
      • 1...Kh4!
    • 1.Qxg5+?
      • 1...Kh3
        • 2.Qg3#
        • 2.Qh5#
      • 1...Kxg5!
    • 1.Qf5+?
      • 1...Kh5
        • 2.Qh3#
      • 1...Kh4!
    • 1.Qe6+?
      • 1...Kf4
        • 2.Qf5#
        • 2.Qe4#
      • 1...Kh5
        • 2.Qh3#
      • 1...Kh4!
    • 1.Qg6?
      • 1...Kh3
        • 2.Qh5#
      • 1...Kf4
        • 2.Qe4#
        • 2.Qf5#
      • 1...Kh4!
    • 1.Qf7?
      • 1...Kh3
        • 2.Qh5#
      • 1...Kh4!
  • Keys
    • 1.Qh8!
      • 1...Kh3
        • 2.Bf5#
      • 1...Kf4
        • 2.Qd4#
      • 1...Kh4
        • 2.Bf5#
      • 1...Kh5
        • 2.Bf5#

Anticipated by 1940(1856), 42024(1861), 52607(1875)

This anticipates 81326(1972), 172337(1996), 205679(1998)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • B(C);CHECK
      • Vars
        • K(a);S_FLIGHT::QAR(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);
      • Vars
        • K(a);S_FLIGHT::QAR2(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);CHECK,XP(b)
      • Refutation
        • K(a);P-FLIGHT,XQ(B)
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);OGATE,P_SPINP(b),S_FLIGHT::QAR2(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);OGATE,S_FLIGHT::QAR2(B)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(B);P_PINP(b)
      • Vars
        • K(a);N_SPINP(b),S_FLIGHT::QAR2(B)
      • Refutation
        • K(a);N_SPINP(b),P-FLIGHT
    • Try
      • Q(B);
      • Vars
        • K(a);S_FLIGHT::QAR2(B)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(B);
    • Vars
      • K(a);S_FLIGHT::QAR(B)+B(C),DCHECK
      • K(a);P-FLIGHT::QAR2(B)
      • K(a);P-FLIGHT::QAR(B)+B(C)
      • K(a);S_FLIGHT::QAR(B)+B(C)
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