MESON Chess Problem Database

Problem Display
PID: 186730 (8/8/8/8/Q7/n7/kB6/1nK5 w - - 0 1)

Caine, Walter Edmund

The Observer, 1933

(First published on Sun Jan 1 1933)

8/8/8/8/Q7/n7/kB6/1nK5

#2

3 + 3

15239 Valois Notebooks 2019
5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Sd2
      • 2.Qxa3#
    • 1...Sc3
      • 2.Qxa3#
  • Tries
    • 1.Qa5?
      • 1...Sd2
        • 2.Qxa3#
      • 1...Sc3
        • 2.Qxa3#
      • 1...Kb3!
    • 1.Qa6?
      • 1...Sd2
        • 2.Qxa3#
      • 1...Sc3
        • 2.Qxa3#
      • 1...Kb3!
    • 1.Qa7?
      • 1...Sd2
        • 2.Qxa3#
      • 1...Sc3
        • 2.Qxa3#
      • 1...Kb3!
    • 1.Qa8?
      • 1...Sd2
        • 2.Qxa3#
      • 1...Sc3
        • 2.Qxa3#
      • 1...Kb3!
  • Keys
    • 1.Qb4!
      • 1...Sd2
        • 2.Qxa3#
      • 1...Sc3
        • 2.Qxa3#
      • 1...Sc2
        • 2.Qc4#
      • 1...Sc4
        • 2.Qxc4#
      • 1...Sb5
        • 2.Qc4#

Anticipated by 227849(1926)

FEATURES

  • Static
    • TYPE = WAITER
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::QAR1(C),XS(c)
  • Tries
    • Try
      • Q(C);
      • Vars
        • S(a);N_GUARD::QAR1(C),XS(c)
      • Refutation
        • K(b);N_SPINS(c),S_FLIGHT
    • Try
      • Q(C);
      • Vars
        • S(a);N_GUARD::QAR1(C),XS(c)
      • Refutation
        • K(b);N_SPINS(c),S_FLIGHT
    • Try
      • Q(C);
      • Vars
        • S(a);N_GUARD::QAR1(C),XS(c)
      • Refutation
        • K(b);N_SPINS(c),S_FLIGHT
    • Try
      • Q(C);
      • Vars
        • S(a);N_GUARD::QAR1(C),XS(c)
      • Refutation
        • K(b);N_SPINS(c),S_FLIGHT
  • Actual
    • Q(C);N_PINS(c)
    • Vars
      • S(a);N_GUARD::QAR1(C),XS(c)
      • S(c);N_GUARD::QAB(C)
      • S(c);N_GUARD::QAB(C),XS(c)
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