MESON Chess Problem Database

Problem Display
PID: 185868 (4RnB1/6Bp/4Nnp1/K3k2r/1p2N1rb/4Pp2/2Q5/8 w - - 0 1)

Daniel, Arthur William

The Observer, 1932

(First published on Sun Feb 28 1932)

4RnB1/6Bp/4Nnp1/K3k2r/1p2N1rb/4Pp2/2Q5/8

#2

8 + 10

14868 Pirnie Collection 2012
15239 Valois Notebooks 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Kd5
      • 2.Sf4#
      • 2.Sc7#
    • 1...Kf5
      • 2.Sd4#
    • 1...Rxe4
      • 2.Qc5#
    • 1...Rf5
      • 2.Sxf8#
    • 1...Sd7
      • 2.Sd4#
  • Tries
    • 1.S6g5+?
      • 1...Se6
        • 2.Qc5#
      • 1...Kf5!
    • 1.Bxf6+?
      • 1...Kd5
        • 2.Sf4#
        • 2.Sc7#
        • 2.Sxf8#
      • 1...Kf5
        • 2.Sd4#
        • 2.Sg7#
      • 1...Bxf6!
    • 1.Qc7+?
      • 1...Kd5
        • 2.Sf4#
      • 1...Kf5
        • 2.Sd4#
      • 1...Kxe4+!
  • Keys
    • 1.Qc8!
      • threat
        • 2.Sxf8#
      • 1...Kxe4+
        • 2.Sc5#
      • 1...Kd5
        • 2.Sf4#
      • 1...Kf5
        • 2.Sd4#
      • 1...Rxe4
        • 2.Qc5#
      • 1...Sxe6
        • 2.Qxe6#
      • 1...Sd7
        • 2.Sd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • K(e);N_SPINS(g),P-FLIGHT::S(E)
    • R(c);SBLOCK,XS(C)::QAR2(A)
    • R(f);SBLOCK::R(G)+S(E),XS(j)
    • S(j);N_GUARD::R(G)+S(E)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • S(j);N_SPINS(g),P_SPINS(j)::QAR2(A)
      • Refutation
        • K(e);N_SPINS(g),P-FLIGHT
    • Try
      • B(F);CHECK,XS(g)
      • Refutation
        • B(d);XB(F)
    • Try
      • Q(A);CHECK
      • Vars
        • K(e);N_SPINS(g),P-FLIGHT::B(H)+S(E),DCHECK
        • K(e);N_SPINS(g),P-FLIGHT::S(E)
      • Refutation
        • K(e);CHECK,N_SPINS(g),P-FLIGHT,XS(C)
  • Actual
    • Q(A);
    • Threat
      • R(G)+S(E),XS(j)
    • Vars
      • K(e);CHECK,N_SPINS(g),P-FLIGHT,XS(C)::R(G)+S(E),DCHECK
      • K(e);N_SPINS(g),P-FLIGHT::B(H)+S(E),DCHECK
      • K(e);N_SPINS(g),P-FLIGHT::QAB(A)+S(E),DCHECK
      • R(c);SBLOCK,XS(C)::QAR2(A)
      • S(j);N_SPINS(g),OGATE,P_SPINS(j),XS(E)::QAR1(A),XS(j)
      • S(j);N_GUARD::R(G)+S(E)
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