MESON Chess Problem Database

Problem Display
PID: 198315 (8/BQ6/8/1p6/1k6/8/2K5/8 w - - 0 1)

Reshevsky, Samual Herman

American Chess Bulletin, 1920

8/BQ6/8/1p6/1k6/8/2K5/8

#2

3 + 2

5454 Near Snap 2019
6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Kc4
      • 2.Qe4#
  • Tries
    • 1.Qf3?
      • 1...Kc4
        • 2.Qe4#
        • 2.Qb3#
      • 1...Ka5
        • 2.Qa3#
      • 1...Ka4!
    • 1.Qxb5+?
      • 1...Ka3
        • 2.Qb3#
        • 2.Qa5#
      • 1...Kxb5!
    • 1.Qb6?
      • 1...Ka3
        • 2.Qa5#
      • 1...Kc4
        • 2.Qd4#
        • 2.Qc5#
      • 1...Ka4!
    • 1.Qc7?
      • 1...Ka3
        • 2.Qa5#
      • 1...Ka4!
    • 1.Qe7+?
      • 1...Kc4
        • 2.Qc5#
        • 2.Qe4#
      • 1...Ka5
        • 2.Qa3#
      • 1...Ka4!
  • Keys
    • 1.Qa8!
      • 1...Ka3
        • 2.Bc5#
      • 1...Ka4
        • 2.Bc5#
      • 1...Kc4
        • 2.Qe4#
      • 1...Ka5
        • 2.Bc5#

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 = 3
    • REMOVED MATES = 0
  • Sets
    • K(a);N_SPINP(b),P-FLIGHT::QAR2(C)
  • Tries
    • Try
      • Q(C);N_PINP(b)
      • Vars
        • K(a);S_FLIGHT::QAR2(C)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(C);CHECK,XP(b)
      • Refutation
        • K(a);P-FLIGHT,XQ(C)
    • Try
      • Q(C);
      • Vars
        • K(a);N_SPINP(b),S_FLIGHT::QAR2(C)
      • Refutation
        • K(a);N_SPINP(b),P-FLIGHT
    • Try
      • Q(C);N_PINP(b)
      • Vars
        • K(a);S_FLIGHT::QAR2(C)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(C);CHECK,N_PINP(b)
      • Vars
        • K(a);OGATE,S_FLIGHT::QAR2(C)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • Q(C);N_PINP(b)
    • Vars
      • K(a);S_FLIGHT::QAR(C)+B(B),DCHECK
      • K(a);P-FLIGHT::QAR(C)+B(B)
      • K(a);P-FLIGHT::QAR2(C)
      • K(a);S_FLIGHT::QAR(C)+B(B)
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