MESON Chess Problem Database

Problem Display
PID: 170152 (1r3RB1/NPp1p3/1BPkP2N/6R1/3P1n2/bn6/7K/8 w - - 0 1)

Lewis, Gregory

Tages-Anzeiger, 1982

1r3RB1/NPp1p3/1BPkP2N/6R1/3P1n2/bn6/7K/8

#2

11 + 7

6490 yacpdb 2018
5454 Near Snap 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rxb7
      • 2.Rd8#
    • 1...Rc8
      • 2.bxc8S#
    • 1...Rd8
      • 2.Rxd8#
    • 1...Sd5
      • 2.Sf5#
    • 1...Sxe6
      • 2.Sf7#
  • Tries
    • 1.Rd5+?
      • 1...Sxd5
        • 2.Sf5#
      • 1...Kxd5!
  • Keys
    • 1.Rc8!
      • threat
        • 2.Bxc7#
      • 1...Rxb7
        • 2.Rd8#
      • 1...Rxc8
        • 2.bxc8S#
      • 1...Sxe6
        • 2.Sf7#
      • 1...cxb6
        • 2.Sb5#
      • 1...Sd5
        • 2.Sf5#

This anticipates 158608(1985)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • R(g);N_GUARD,XP(I)::R(J)
    • R(g);OGATE::PXR(g)=S
    • R(g);N_GUARD::R(J),XR(g)
    • S(c);SBLOCK::S(G)
    • S(c);SBLOCK,XP(F)::S(G)
  • Tries
    • Try
      • R(C);CHECK
      • Vars
        • S(c);SBLOCK,XR(C)::S(G)
      • Refutation
        • K(d);P-FLIGHT,XR(C)
  • Actual
    • R(J);
    • Threat
      • B(D),XP(e)
    • Vars
      • R(g);N_GUARD,XP(I)::R(J)
      • R(g);OGATE,XR(J)::PXR(g)=S
      • S(c);SBLOCK,XP(F)::S(G)
      • P(e);XB(D)::S(H)
      • S(c);SBLOCK::S(G)
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