MESON Chess Problem Database

Problem Display
PID: 145130 (8/1K5B/4P3/1R1pk1P1/2p1NN2/4p1B1/5Pb1/3r4 w - - 0 1)

Langstaff, William A

The Observer, 1924

(First published on Sun Oct 19 1924)

8/1K5B/4P3/1R1pk1P1/2p1NN2/4p1B1/5Pb1/3r4

#2

9 + 6

14868 Pirnie Collection 2012
15239 Valois Notebooks 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Kd4
      • 2.Rxd5#
    • 1...Ra1
      • 2.Rxd5#
    • 1...Rc1
      • 2.Rxd5#
    • 1...Re1
      • 2.Rxd5#
    • 1...Rf1
      • 2.Rxd5#
    • 1...Rg1
      • 2.Rxd5#
    • 1...Rh1
      • 2.Rxd5#
  • Keys
    • 1.Sc5!
      • threat
        • 2.Se2#
      • 1...d4+
        • 2.Se4#
      • 1...Kd4
        • 2.Se2#
      • 1...Kd6
        • 2.Sg6#
      • 1...Rd4
        • 2.Sfd3#
      • 1...e2
        • 2.Sxe2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 6
  • Sets
    • K(f);N_SPINP(e),S_FLIGHT::R1(E),XP(e)
    • R(a);N_GUARD::R1(E),XP(e)
  • Actual
    • S(C);N_PINP(e)
    • Threat
      • B(B)+S(D)
    • Vars
      • P(e);CHECK,SBLOCK::R(E)+S(C)
      • K(f);S_FLIGHT::S(D)
      • K(f);S_FLIGHT::B(B)+S(D)
      • R(a);SBLOCK::B(B)+S(D),DCHECK
      • P(c);::B(B)+S(D),XP(c)
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