MESON Chess Problem Database

Problem Display
PID: 163092 (8/5B1b/6p1/1pBp4/Qp1pkPK1/3p4/2Pp4/2nNb3 w - - 0 1)

Boswell, Edward

Pratt, R

The Observer, 1925

(First published on Sun Mar 15 1925)

8/5B1b/6p1/1pBp4/Qp1pkPK1/3p4/2Pp4/2nNb3

#2

7 + 11

15239 Valois Notebooks 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Bg8
      • 2.Bxg6#
    • 1...b3
      • 2.Qxd4#
  • Tries
    • 1.Qb3?
      • threat
        • 2.Bxd5#
        • 2.Qxd5#
      • 1...dxc2
        • 2.Bxd5#
        • 2.Qf3#
      • 1...Bg8
        • 2.Bxg6#
        • 2.Qxd5#
      • 1...Sxb3!
    • 1.Qa8?
      • threat
        • 2.Bxd5#
        • 2.Qxd5#
        • 2.Qe8#
      • 1...Bh4
        • 2.Bxd5#
        • 2.Qxd5#
      • 1...Bg8
        • 2.Bxg6#
        • 2.Qxd5#
        • 2.Qe8#
      • 1...dxc2!
  • Keys
    • 1.c4!
      • threat
        • 2.Bxd5#
      • 1...bxc4
        • 2.Qe8#
      • 1...dxc4
        • 2.Qa8#
      • 1...bxc4 ep
        • 2.Qxd4#
      • 1...dxc4 ep
        • 2.Sxc3#
      • 1...Bg8
        • 2.Bxg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • B(k);N_GUARD::B(G),XP(j)
    • P(e);OGATE,P_SPINP(f)::QAR1(C),XP(f)
  • Tries
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Refutation
        • S(a);XQ(C)
    • Try
      • Q(C);P_PINP(i)
      • Threat
        • DUALS(3)
      • Refutation
        • P(d);XP(B)
  • Actual
    • P(B);
    • Threat
      • B(G),XP(i)
    • Vars
      • P(h);OGATE,XP(B)::QAR(C)
      • P(i);OGATEB,XP(B)::QAB(C)
      • P(e);EP,OGATE,P_SPINP(f),XP(B)::QAR1(C),XP(f)
      • P(f);EP,N_GUARD,P_SPINP(e),XP(B)::S(A),XP(f)
      • B(k);N_GUARD::B(G),XP(j)
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