MESON Chess Problem Database

Problem Display
PID: 153778 (2n5/1p1Q4/kb6/1N6/8/1N1K4/5B2/8 w - - 0 1)

Harley, Brian

The Observer, 1948

(First published on Sun May 2 1948)

2n5/1p1Q4/kb6/1N6/8/1N1K4/5B2/8

#2

5 + 4

15290 Harley Scrapbook 2015
15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Ba7
      • 2.Sc7#
    • 1...Bc7
      • 2.Sxc7#
  • Tries
    • 1.Sc5+?
      • 1...Ka5
        • 2.Be1#
      • 1...Bxc5!
    • 1.Sd6?
      • threat
        • 2.Qxb7#
      • 1...Ka7
        • 2.Qxb7#
      • 1...Bc7
        • 2.Qb5#
      • 1...Sxd6!
    • 1.Qc6?
      • 1...Sd6
        • 2.Qxb6#
      • 1...Sa7
        • 2.Sc7#
        • 2.Qxb6#
      • 1...Se7
        • 2.Qxb6#
      • 1...bxc6!
    • 1.Qe6?
      • 1...Kxb5
        • 2.Qc4#
      • 1...Sa7
        • 2.Sc7#
        • 2.Qxb6#
      • 1...Se7
        • 2.Qxb6#
      • 1...Sd6!
  • Keys
    • 1.Qc7!
      • 1...Kxb5
        • 2.Qc4#
      • 1...Bxf2
        • 2.Qa5#
      • 1...Bxc7
        • 2.Sxc7#
      • 1...Be3
        • 2.Qa5#
      • 1...Bd4
        • 2.Qa5#
      • 1...Ba5
        • 2.Qxa5#
      • 1...Bc5
        • 2.Qa5#
      • 1...Ba7
        • 2.Qa5#
      • 1...Sd6
        • 2.Qxb6#
      • 1...Sa7
        • 2.Qxb6#
      • 1...Se7
        • 2.Qxb6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 9
    • REMOVED MATES = 0
  • Sets
    • B(b);N_GUARD::S(D)
    • B(b);N_GUARD::S(D),XB(b)
  • Tries
    • Try
      • S(B);CHECK
      • Vars
        • K(a);P-FLIGHT::B(A)
      • Refutation
        • B(b);XS(B)
    • Try
      • S(D);
      • Threat
        • QAB1(E),XP(c)
      • Vars
        • K(a);P-FLIGHT,P_SPINB(b),P_SPINP(c)::QAR1(E),XP(c)
        • B(b);::QAB1(E)
      • Refutation
        • S(d);XS(D)
    • Try
      • Q(E);P_PINB(b)
      • Vars
        • S(d);N_GUARD::QAR1(E),XB(b)
      • Refutation
        • P(c);N_SPINB(b),XQ(E)
    • Try
      • Q(E);P_PINB(b)
      • Vars
        • K(a);N_SPINB(b),OGATEB,S_FLIGHT,XS(D)::QAB1(E)
        • S(d);N_GUARD::QAR1(E),XB(b)
      • Refutation
        • S(d);N_SPINB(b)
  • Actual
    • Q(E);
    • Vars
      • K(a);OGATEB,S_FLIGHT,XS(D)::QAB1(E)
      • B(b);OGATE,XB(A)::QAR1(E)
      • B(b);XQ(E)::S(D),XB(b)
      • B(b);OGATE::QAR1(E)
      • B(b);OGATE::QAR1(E),XB(b)
      • S(d);N_GUARD::QAR1(E),XB(b)
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