MESON Chess Problem Database

Problem Display
PID: 141889 (b7/3K4/3nNR2/NB6/4kBp1/3p4/Q6p/3n3q w - - 0 1)

Alexander, Frederick Forrest Lawrie

The Observer, 1934

(First published on Sun Sep 30 1934)

b7/3K4/3nNR2/NB6/4kBp1/3p4/Q6p/3n3q

#2

7 + 8

14868 Pirnie Collection 2011
15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Kf3
      • 2.Sg5#
    • 1...Qg2
      • 2.Qxg2#
    • 1...Qe1
      • 2.Qg2#
    • 1...Bc6+
      • 2.Bxc6#
    • 1...Sb7
      • 2.Bc6#
  • Tries
    • 1.Sb3?
      • threat
        • 2.Sd2#
      • 1...Bc6+
        • 2.Bxc6#
      • 1...Kf3
        • 2.Sg5#
      • 1...Qg2
        • 2.Qxg2#
      • 1...Qe1
        • 2.Qg2#
      • 1...Sc4
        • 2.Qxa8#
      • 1...d2
        • 2.Sxd2#
      • 1...Kd5!
    • 1.Bxd3+?
      • 1...Kf3
        • 2.Sd4#
        • 2.Sg5#
        • 2.Qe2#
      • 1...Kxd3!
  • Keys
    • 1.Sc4!
      • threat
        • 2.Sd2#
      • 1...Bc6+
        • 2.Bxc6#
      • 1...Kf3
        • 2.Sg5#
      • 1...Kd5
        • 2.Sxd6#
      • 1...Sxc4
        • 2.Qxa8#
      • 1...d2
        • 2.Sxd2#
      • 1...Qg2
        • 2.Qxg2#
      • 1...Qe1
        • 2.Qg2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • K(e);S_FLIGHT::S(E)
    • Q(b);N_GUARD::QAB(A),XQ(b)
    • Q(b);N_GUARD::QAB(A)
    • B(h);CHECK,N_GUARD::B(D),XB(h)
    • S(g);S_CUTB(h)::B(D)
  • Tries
    • Try
      • S(C);
      • Threat
        • S(C)
      • Vars
        • B(h);CHECK,N_GUARD::B(D),XB(h)
        • K(e);S_FLIGHT::S(E)
        • Q(b);N_GUARD::QAB(A),XQ(b)
        • Q(b);N_GUARD::QAB(A)
        • S(g);N_GUARD::QAB(A),XB(h)
        • P(d);::S(C),XP(d)
      • Refutation
        • K(e);S_FLIGHT
    • Try
      • B(D);CHECK,XP(d)
      • Refutation
        • K(e);S_FLIGHT,XB(D)
  • Actual
    • S(C);
    • Threat
      • S(C)
    • Vars
      • B(h);CHECK,N_GUARD::B(D),XB(h)
      • K(e);S_FLIGHT::S(E)
      • K(e);S_FLIGHT::QAB(A)+S(C),XS(g)
      • S(g);N_GUARD,XS(C)::QAB(A),XB(h)
      • P(d);::S(C),XP(d)
      • Q(b);N_GUARD::QAB(A),XQ(b)
      • Q(b);N_GUARD::QAB(A)
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