MESON Chess Problem Database

Problem Display
PID: 185186 (R7/B7/8/rP1Q3K/kr1P2R1/1p6/1P6/8 w - - 0 1)

Easter, Norris

The Observer, 1930

(First published on Sun Sep 7 1930)

R7/B7/8/rP1Q3K/kr1P2R1/1p6/1P6/8

#2

8 + 4

5454 Near Snap 2018
15239 Valois Notebooks 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Rc4
      • 2.Qxc4#
    • 1...Rxd4
      • 2.Rxd4#
    • 1...Rxa7
      • 2.Rxa7#
  • Keys
    • 1.Qc6!
      • 1...Rbxb5+
        • 2.d5#
      • 1...Raxb5+
        • 2.Bc5#
      • 1...Rxd4
        • 2.Rxd4#
      • 1...Rxa7
        • 2.Rxa7#
      • 1...Rc4
        • 2.Qxc4#
      • 1...Ra6
        • 2.Qxa6#

This anticipates 39810(1934)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • R(c);OGATEB::QAR2(E),XR(c)
    • R(c);OGATE,P_SPINR(c),XP(B)::R(C),XR(c)
    • R(d);OGATE,P_SPINR(d),XB(G)::R(H),XR(d)
  • Actual
    • Q(E);P_SPINP(D)
    • Vars
      • R(c);CHECK,P_SPINR(c),XP(D)::R(C)+P(B)
      • R(d);CHECK,OGATEB,P_SPINR(d),XP(D)::R(H)+B(G)
      • R(c);OGATE,P_SPINR(c),XP(B)::R(C),XR(c)
      • R(d);N_PINP(D),OGATE,P_SPINR(d),XB(G)::R(H),XR(d)
      • R(c);OGATEB::QAR2(E),XR(c)
      • R(d);N_PINP(D),OGATEB::QAR2(E),XR(d)
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