MESON Chess Problem Database

Problem Display
PID: 194723 (n5n1/1K1N4/4p3/2pkB3/Q4P2/6p1/6P1/8 w - - 0 1)

Andrade, Barry Jack da Costa

The Observer, 1941

(First published on Sun May 11 1941)

n5n1/1K1N4/4p3/2pkB3/Q4P2/6p1/6P1/8

#2

6 + 6

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Sb6
      • 2.Sxb6#
    • 1...Sc7
      • 2.Sb6#
    • 1...Sf6
      • 2.Sxf6#
    • 1...Sh6
      • 2.Sf6#
    • 1...Se7
      • 2.Sf6#
    • 1...c4
      • 2.Qc6#
  • Tries
    • 1.Ka7?
      • 1...Sb6
        • 2.Sxb6#
      • 1...Sc7
        • 2.Sb6#
      • 1...Sf6
        • 2.Sxf6#
      • 1...Sh6
        • 2.Sf6#
      • 1...Se7
        • 2.Sf6#
      • 1...c4!
    • 1.Kc8?
      • 1...Sb6+
        • 2.Sxb6#
      • 1...c4
        • 2.Qxa8#
      • 1...Sc7
        • 2.Sb6#
      • 1...Sf6
        • 2.Sxf6#
      • 1...Sh6
        • 2.Sf6#
      • 1...Se7+!
    • 1.Qb3+?
      • 1...c4
        • 2.Qf3#
      • 1...Ke4!
    • 1.Qa6?
      • threat
        • 2.Qd3#
      • 1...c4
        • 2.Qc6#
      • 1...Ke4!
  • Keys
    • 1.Kb8!
      • 1...c4
        • 2.Qxa8#
      • 1...Sb6
        • 2.Sxb6#
      • 1...Sc7
        • 2.Sb6#
      • 1...Sf6
        • 2.Sxf6#
      • 1...Sh6
        • 2.Sf6#
      • 1...Se7
        • 2.Sf6#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 1
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • S(e);N_GUARD::S(F),XS(e)
    • S(e);N_GUARD::S(F)
    • S(f);N_GUARD::S(F),XS(f)
    • S(f);N_GUARD::S(F)
    • P(b);::QAB1(B)
  • Tries
    • Try
      • K(E);P-FLIGHT
      • Vars
        • S(e);N_GUARD::S(F),XS(e)
        • S(e);N_GUARD::S(F)
        • S(f);N_GUARD::S(F),XS(f)
        • S(f);N_GUARD::S(F)
      • Refutation
        • P(b);
    • Try
      • K(E);S_FLIGHT
      • Vars
        • S(e);CHECK,N_GUARD::S(F),XS(e)
        • P(b);SBLOCK::QAB(B),XS(e)
        • S(e);N_GUARD::S(F)
        • S(f);N_GUARD::S(F),XS(f)
        • S(f);N_GUARD::S(F)
      • Refutation
        • S(f);CHECK
    • Try
      • Q(B);CHECK
      • Vars
        • P(b);P_SPINP(b),SBLOCK::QAB(B)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(B);
      • Threat
        • QAR2(B)
      • Vars
        • P(b);::QAB1(B)
      • Refutation
        • K(c);S_FLIGHT
  • Actual
    • K(E);P-FLIGHT
    • Vars
      • P(b);SBLOCK::QAB(B),XS(e)
      • S(e);N_GUARD::S(F),XS(e)
      • S(e);N_GUARD::S(F)
      • S(f);N_GUARD::S(F),XS(f)
      • S(f);N_GUARD::S(F)
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