MESON Chess Problem Database

Problem Display
PID: 199242 (8/B1p1RB2/3p1n2/4b2P/R1pNkp2/2Qp2nK/8/2N5 w - - 0 1)

Burkill, HR

The Observer, 1945

(First published on Sun Feb 25 1945)

8/B1p1RB2/3p1n2/4b2P/R1pNkp2/2Qp2nK/8/2N5

#2

9 + 9

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Sh1
      • 2.Qe1#
    • 1...Sgxh5
      • 2.Qe1#
    • 1...d2
      • 2.Qf3#
  • Tries
    • 1.Sf3?
      • threat
        • 2.Qxd3#
      • 1...Kf5
        • 2.Bg6#
      • 1...d2
        • 2.Qd3#
      • 1...Kxf3!
  • Keys
    • 1.Se6!
      • threat
        • 2.Qxd3#
      • 1...Kf3
        • 2.Sg5#
      • 1...Kd5
        • 2.Qxc4#
      • 1...Kf5
        • 2.Bg6#
      • 1...Bxc3
        • 2.Sd4#
      • 1...Bd4
        • 2.Sxd4#
      • 1...d2
        • 2.Qd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 2
  • Sets
    • S(b);N_GUARD::QAR(B)
    • S(b);N_GUARD,XP(F)::QAR(B)
    • P(a);OGATE::QAB1(B)
  • Tries
    • Try
      • S(E);P_PINP(c)
      • Threat
        • QAB1(B),XP(a)
      • Vars
        • K(d);N_SPINB(f),N_SPINP(c),S_FLIGHT::B(I)
        • P(a);::QAB1(B)
      • Refutation
        • K(d);N_SPINB(f),N_SPINP(c),P_SPINP(a),S_FLIGHT,XS(E)
  • Actual
    • S(E);N_PINB(f),P_PINP(c)
    • Threat
      • QAB1(B),XP(a)
    • Vars
      • K(d);N_SPINP(c),P_SPINP(a),S_FLIGHT::S(E)
      • K(d);N_SPINP(c),S_FLIGHT::QAB1(B),XP(c)
      • K(d);N_SPINP(c),S_FLIGHT::B(I)
      • B(f);XQ(B)::R(H)+S(E)
      • B(f);N_SPINP(c)::R(H)+S(E),XB(f)
      • P(a);::QAB1(B)
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