MESON Chess Problem Database

Problem Display
PID: 153073 (6nK/3N1k2/6Np/6p1/3nQ3/7B/8/8 w - - 0 1)

Harley, Brian

The Observer, 1936

(First published on Sun Sep 6 1936)

6nK/3N1k2/6Np/6p1/3nQ3/7B/8/8

#2

5 + 5

15290 Harley Scrapbook 2014
15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Sc2
      • 2.Qe6#
    • 1...Se2
      • 2.Qe6#
    • 1...Sb3
      • 2.Qe6#
    • 1...Sf3
      • 2.Qe6#
    • 1...Sb5
      • 2.Qe6#
    • 1...Sc6
      • 2.Qe6#
    • 1...Se6
      • 2.Qxe6#
  • Tries
    • 1.Kh7?
      • threat
        • 2.Sh8#
      • 1...Se6
        • 2.Qxe6#
      • 1...Se7
        • 2.Qxe7#
      • 1...Sf6+!
    • 1.Sde5+?
      • 1...Ke8
        • 2.Qa8#
      • 1...Kf6!
    • 1.Be6+?
      • 1...Ke8
        • 2.Qa8#
      • 1...Sxe6!
    • 1.Qd5+?
      • 1...Ke8
        • 2.Qxg8#
      • 1...Se6
        • 2.Qxe6#
      • 1...Kxg6!
    • 1.Qe7+?
      • 1...Kxg6
        • 2.Qe8#
      • 1...Sxe7!
  • Keys
    • 1.Qa8!
      • threat
        • 2.Qxg8#
      • 1...Kxg6
        • 2.Qe8#
      • 1...Sf6
        • 2.Sde5#
      • 1...Se7
        • 2.Sge5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 7
  • Sets
    • S(a);N_GUARD::QAB1(B)
    • S(a);N_GUARD::QAB1(B),XS(a)
  • Tries
    • Try
      • K(E);P-FLIGHT
      • Threat
        • S(C)
      • Vars
        • S(a);N_GUARD::QAB1(B),XS(a)
        • S(e);N_GUARD::QAR1(B),XS(e)
      • Refutation
        • S(e);CHECK
    • Try
      • S(D);CHECK
      • Vars
        • K(d);S_FLIGHT::QAR(B)
      • Refutation
        • K(d);P-FLIGHT
    • Try
      • B(A);CHECK
      • Vars
        • K(d);S_FLIGHT::QAR(B)
      • Refutation
        • S(a);XB(A)
    • Try
      • Q(B);CHECK
      • Vars
        • K(d);OGATE,S_FLIGHT::QAR2(B),XS(e)
        • S(a);N_GUARD,P_SPINS(a)::QAB1(B),XS(a)
      • Refutation
        • K(d);S_FLIGHT,XS(C)
    • Try
      • Q(B);CHECK
      • Vars
        • K(d);S_FLIGHT,XS(C)::QAB(B)
      • Refutation
        • S(e);XQ(B)
  • Actual
    • Q(B);
    • Threat
      • QAB1(B),XS(e)
    • Vars
      • K(d);S_FLIGHT,XS(C)::QAB(B)
      • S(e);SBLOCK::S(D)
      • S(e);SBLOCK::S(C)
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