MESON Chess Problem Database

Problem Display
PID: 203017 (2K3B1/3Rp1n1/1R3N2/P1k2b2/p1N5/2Pp4/8/8 w - - 0 1)

Lane, JF

The Observer, 1951

(First published on Sun Aug 5 1951)

2K3B1/3Rp1n1/1R3N2/P1k2b2/p1N5/2Pp4/8/8

#2

8 + 6

15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Bh3
      • 2.Se4#
    • 1...Be4
      • 2.Sxe4#
    • 1...Bg4
      • 2.Se4#
    • 1...Bg6
      • 2.Rc7#
    • 1...Bxd7+
      • 2.Sxd7#
    • 1...Bh7
      • 2.Rc7#
    • 1...e6
      • 2.Rc7#
  • Keys
    • 1.Sb2!
      • threat
        • 2.Sxa4#
      • 1...Bxd7+
        • 2.Sxd7#
      • 1...Be6
        • 2.Se4#
      • 1...Se6
        • 2.Rd5#
      • 1...a3
        • 2.Sa4#
      • 1...e6
        • 2.Rc7#

This is a version

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • B(d);N_GUARD::S(E)
    • B(d);N_GUARD,N_PINR(F)::S(E),XB(d)
    • B(d);N_PINR(F)::R(F)
    • B(d);CHECK,XR(F)::S(E),XB(d)
    • P(e);N_PINR(F)::R(F)
  • Actual
    • S(B);
    • Threat
      • S(B),XP(b)
    • Vars
      • B(d);CHECK,XR(F)::S(E),XB(d)
      • B(d);N_GUARD::S(E)
      • S(f);N_PINR(F)::R1(F)
      • P(b);::S(B)
      • P(e);N_PINR(F)::R(F)
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