MESON Chess Problem Database

Problem Display
PID: 190856 (3nK3/B1N5/2p3Q1/4k3/5b2/4pR2/8/8 w - - 0 1)

Fenner, A Jack

The Observer, 1938

(First published on Sun Jun 12 1938)

3nK3/B1N5/2p3Q1/4k3/5b2/4pR2/8/8

#2

5 + 5

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Se6
      • 2.Qxe6#
    • 1...Sb7
      • 2.Qe6#
    • 1...Sf7
      • 2.Qe6#
  • Tries
    • 1.Bc5?
      • 1...Bh2
        • 2.Qf5#
      • 1...Bg3
        • 2.Qf5#
      • 1...Bg5
        • 2.Qf5#
      • 1...Bh6
        • 2.Qf5#
      • 1...Se6
        • 2.Qxe6#
      • 1...Sb7
        • 2.Qe6#
      • 1...Sf7
        • 2.Qe6#
      • 1...e2!
    • 1.Qf5+?
      • 1...Kd6
        • 2.Qxf4#
      • 1...Kxf5!
  • Keys
    • 1.Qg4!
      • threat
        • 2.Qxf4#
      • 1...Ke4
        • 2.Rxe3#
      • 1...Kd6
        • 2.Qxf4#
      • 1...Kf6
        • 2.Bd4#
      • 1...Bh2
        • 2.Qd4#
      • 1...Bg3
        • 2.Qd4#
      • 1...Bg5
        • 2.Qd4#
      • 1...Bh6
        • 2.Qd4#
      • 1...Se6
        • 2.Qxe6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 2
  • Sets
    • S(e);N_GUARD::QAR1(B),XS(e)
    • S(e);N_GUARD::QAR1(B)
  • Tries
    • Try
      • B(C);
      • Vars
        • B(b);::QAR1(B)
        • S(e);N_GUARD::QAR1(B),XS(e)
        • S(e);N_GUARD::QAR1(B)
      • Refutation
        • P(a);
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);S_FLIGHT::QAB(B),XB(b)
      • Refutation
        • K(c);P-FLIGHT,P_SPINB(b),XQ(B)
  • Actual
    • Q(B);
    • Threat
      • QAB1(B),XB(b)
    • Vars
      • K(c);P-FLIGHT,P_SPINB(b)::R1(A),XP(a)
      • K(c);S_FLIGHT::QAB(B),XB(b)
      • K(c);P_SPINB(b),S_FLIGHT::B(C)
      • B(b);OGATE::QAB1(B)
      • S(e);N_GUARD::QAR1(B),XS(e)
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