MESON Chess Problem Database

Problem Display
PID: 340 (1b3B2/2N2b2/3n4/2Q5/rp3K2/k2N4/1pP5/1B6 w - - 0 1)

Howard, Kenneth Samuel

The Observer, 1926

(First published on Sun Dec 26 1926)

1b3B2/2N2b2/3n4/2Q5/rp3K2/k2N4/1pP5/1B6

#2

7 + 7

887 Mate in Two Moves 1931
5089 The Enjoyment of Chess Problems 1943
5064 100 Years of the American Two-move Chess Problem 1962
15239 Valois Notebooks 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Ra5
      • 2.Qxb4#
      • 2.Qxa5#
    • 1...Ra6
      • 2.Qxb4#
    • 1...Ra7
      • 2.Qxb4#
    • 1...Ra8
      • 2.Qxb4#
  • Tries
    • 1.Bg7?
      • threat
        • 2.Bxb2#
      • 1...Ra5
        • 2.Qxb4#
        • 2.Qxa5#
      • 1...Ra6
        • 2.Qxb4#
      • 1...Ra7
        • 2.Qxb4#
      • 1...Ra8
        • 2.Qxb4#
      • 1...Sc4!
  • Keys
    • 1.Qd4!
      • threat
        • 2.Qxb2#
      • 1...Ra5
        • 2.Qxb4#
      • 1...Ra6
        • 2.Qxb4#
      • 1...Ra7
        • 2.Qxb4#
      • 1...Ra8
        • 2.Qxb4#
      • 1...Sc4
        • 2.Qc3#
      • 1...b3
        • 2.Sb5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • R(c);N_GUARD::QAB1(E),XP(d)
  • Tries
    • Try
      • B(G);
      • Threat
        • B(G),XP(a)
      • Vars
        • R(c);N_GUARD::QAB1(E),XP(d)
      • Refutation
        • S(e);P_PINS(F)
  • Actual
    • Q(E);N_PINP(d)
    • Threat
      • QAB1(E),XP(a)
    • Vars
      • R(c);N_GUARD::QAB1(E),XP(d)
      • S(e);P_PINS(F),P_SPINP(d),S_CUTB(f)::QAR2(E)
      • P(d);P_PINQ(E),P_SPINS(e)::S(F)
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