MESON Chess Problem Database

Problem Display
PID: 184902 (4N2n/8/2PNp3/QK1bk1B1/3pB3/1p6/1P5b/8 w - - 0 1)

Stubbs, Arthur Goodwin

The Observer, 1929

(First published on Sun Jan 27 1929)

4N2n/8/2PNp3/QK1bk1B1/3pB3/1p6/1P5b/8

#2

8 + 7

15239 Valois Notebooks 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Bf4
      • 2.Bf6#
    • 1...Bc4+
      • 2.Kxc4#
    • 1...Bxc6+
      • 2.Kxc6#
    • 1...d3
      • 2.Qc3#
  • Keys
    • 1.Qe1!
      • 1...Bc4+
        • 2.Sxc4#
      • 1...Bxc6+
        • 2.Bxc6#
      • 1...Bxe4
        • 2.Qxe4#
      • 1...d3
        • 2.Qc3#
      • 1...Bg1
        • 2.Qg3#
      • 1...Bg3
        • 2.Qxg3#
      • 1...Bf4
        • 2.Bf6#
      • 1...Sg6
        • 2.Sf7#
      • 1...Sf7
        • 2.Sxf7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • B(a);SBLOCK::B(E)
    • B(d);CHECK::QAR(C)+K(D),XB(d)
    • B(d);CHECK,XP(F)::QAR(C)+K(D),XB(d)
    • P(c);OGATEB::QAB(C)
  • Actual
    • Q(C);
    • Vars
      • B(d);CHECK,N_GUARD::S(G),XB(d)
      • B(d);CHECK,OGATE,XP(F)::QAR(C)+B(B),XB(d)
      • B(d);OGATE,P_SPINB(d),XB(B)::QAR1(C),XB(d)
      • P(c);OGATEB::QAB(C)
      • B(a);N_GUARD::QAB(C)
      • B(a);N_GUARD::QAB(C),XB(a)
      • B(a);SBLOCK::B(E)
      • S(g);N_GUARD::S(G)
      • S(g);N_GUARD::S(G),XS(g)
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