MESON Chess Problem Database

Problem Display
PID: 184467 (4r3/1p3N2/p2R4/Rbk5/1pBp4/1P2r3/4QB2/2b1nK2 w - - 0 1)

Fenner, A Jack

The Observer, 1928

(First published on Sun Nov 11 1928)

4r3/1p3N2/p2R4/Rbk5/1pBp4/1P2r3/4QB2/2b1nK2

#2

8 + 10

15239 Valois Notebooks 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Rxe2
      • 2.Bxd4#
    • 1...Rxb3
      • 2.Bxd4#
    • 1...Rc3
      • 2.Bxd4#
    • 1...Rg3
      • 2.Bxd4#
    • 1...Rh3
      • 2.Bxd4#
    • 1...R3e5
      • 2.Bxd4#
    • 1...R3e6
      • 2.Bxd4#
    • 1...R3e7
      • 2.Bxd4#
  • Tries
    • 1.Qh5+?
      • 1...R3e5
        • 2.Bxd4#
      • 1...R8e5!
  • Keys
    • 1.Be6!
      • threat
        • 2.Qc4#
      • 1...Rxe2
        • 2.Bxd4#
      • 1...Rd3
        • 2.Qe5#
      • 1...Rc3
        • 2.Bxd4#
      • 1...Sd3
        • 2.Qc2#
      • 1...d3
        • 2.Qh5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 6
  • Sets
    • R(c);OGATE,P_SPINP(e),XQ(B)::B(C),XP(e)
    • R(c);OGATE,P_SPINP(e),XP(D)::B(C),XP(e)
    • R(c);OGATE,P_SPINP(e)::B(C),XP(e)
  • Tries
    • Try
      • Q(B);CHECK,P_SPINB(E)
      • Vars
        • R(c);OGATE,P_SPINP(e),P_SPINR(c)::B(C),XP(e)
      • Refutation
        • R(j);P_SPINR(j)
  • Actual
    • B(E);P_SPINQ(B)
    • Threat
      • QAR1(B)
    • Vars
      • R(c);OGATE,P_SPINP(e),XQ(B)::B(C),XP(e)
      • R(c);N_PINQ(B),P_SPINP(e)::QAR2(B)
      • R(c);OGATE,P_SPINP(e)::B(C),XP(e)
      • S(b);N_PINQ(B)::QAR(B)
      • P(e);N_PINQ(B),P_SPINR(c)::QAR(B)
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