MESON Chess Problem Database

Problem Display
PID: 187141 (8/2KQpN2/bp3P2/b3p3/r3kr2/2p1B3/4Rnq1/4N3 w - - 0 1)

Stubbs, Arthur Goodwin

The Observer, 1934

(First published on Sun Nov 4 1934)

8/2KQpN2/bp3P2/b3p3/r3kr2/2p1B3/4Rnq1/4N3

#2

7 + 11

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Qf1
      • 2.Sg5#
    • 1...Qh1
      • 2.Sg5#
    • 1...Qf3
      • 2.Sg5#
    • 1...Qh3
      • 2.Sg5#
    • 1...Qh2
      • 2.Sg5#
    • 1...Qg5
      • 2.Sxg5#
    • 1...Rc4+
      • 2.Bc5#
    • 1...Rf5
      • 2.Qc6#
    • 1...Bb7
      • 2.Bc1#
      • 2.Bd2#
      • 2.Bxf2#
      • 2.Bd4#
      • 2.Bc5#
      • 2.Bxb6#
    • 1...Bc8
      • 2.Bc1#
      • 2.Bd2#
      • 2.Bxf2#
      • 2.Bd4#
      • 2.Bc5#
      • 2.Bxb6#
    • 1...Sd3
      • 2.Bf2#
    • 1...Sg4
      • 2.Sg5#
    • 1...b5+
      • 2.Bb6#
  • Keys
    • 1.Qe6!
      • threat
        • 2.Qxe5#
      • 1...Rc4+
        • 2.Bc5#
      • 1...b5+
        • 2.Bb6#
      • 1...exf6
        • 2.Sd6#
      • 1...Qg5
        • 2.Sxg5#
      • 1...Rf5
        • 2.Qc6#
      • 1...Sd3
        • 2.Bf2#
      • 1...Sg4
        • 2.Sg5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 5
  • Sets
    • Q(b);N_GUARD::S(G)
    • Q(b);N_GUARD::S(G),XQ(b)
    • R(d);CHECK,S_CUTB(i)::R(B)+B(C)
    • R(f);SBLOCK::QAB(F)
    • S(a);S_CUTB(i)::R(B)+B(C)
    • S(a);S_CUTQ(b)::S(G)
    • P(j);CHECK,S_CUTB(i)::R(B)+B(C)
  • Actual
    • Q(F);P_PINP(h)
    • Threat
      • QAR1(F),XP(h)
    • Vars
      • R(d);CHECK,S_CUTB(i)::R(B)+B(C)
      • P(j);CHECK,S_CUTB(i)::R(B)+B(C)
      • P(k);N_GUARD,XP(D)::S(G)
      • Q(b);N_GUARD::S(G),XQ(b)
      • R(f);SBLOCK::QAB(F)
      • S(a);S_CUTB(i)::R(B)+B(C)
      • S(a);S_CUTQ(b)::S(G)
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