MESON Chess Problem Database

Problem Display
PID: 225332 (8/p7/P7/Rp6/1p6/8/P1P5/k1K5 w - - 0 1)

Libis, Zdenek

Sachova skladba, 2003

8/p7/P7/Rp6/1p6/8/P1P5/k1K5

#2

5 + 4

5454 Near Snap 2020
15148 Sadier Collection 2020
3713 Snap 2020

SOLUTION

  • SOUND
  • Sets
    • 1...b3
      • 2.axb3#
  • Tries
    • 1.Ra3?
      • 1...b3
        • 2.axb3#
      • 1...bxa3!
    • 1.Rxb5?
      • 1...Kxa2
        • 2.Ra5#
      • 1...b3!
    • 1.a3?
      • threat
        • 2.axb4#
      • 1...Ka2
        • 2.axb4#
      • 1...bxa3
        • 2.Rxa3#
      • 1...b3!
    • 1.c3?
      • 1...b3
        • 2.axb3#
      • 1...bxc3!
  • Keys
    • 1.a4!
      • threat
        • 2.axb5#
      • 1...Ka2
        • 2.axb5#
      • 1...bxa4
        • 2.Rxa4#
      • 1...bxa4 ep
        • 2.Rxa3#

Anticipated by 119047(1904)

This anticipates 156662(2007)

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • P(b);OGATE::R(D)+P(B),XP(b)
  • Tries
    • Try
      • R(D);
      • Vars
        • P(b);OGATE::R(D)+P(B),XP(b)
      • Refutation
        • P(b);XR(D)
    • Try
      • R(D);XP(c)
      • Vars
        • K(a);OGATEB,P-FLIGHT,XP(B)::R(D)
      • Refutation
        • P(b);
    • Try
      • P(B);
      • Threat
        • R(D)+P(B),XP(b)
      • Vars
        • K(a);P-FLIGHT::R(D)+P(B),XP(b)
        • P(b);OGATE,P_SPINP(b),XP(B)::R(D),XP(b)
      • Refutation
        • P(b);
    • Try
      • P(C);
      • Vars
        • P(b);OGATE::R(D)+P(B),XP(b)
      • Refutation
        • P(b);XP(C)
  • Actual
    • P(B);
    • Threat
      • R(D)+P(B),XP(c)
    • Vars
      • K(a);P-FLIGHT::R(D)+P(B),XP(c)
      • P(c);OGATE,P_SPINP(c),XP(B)::R(D),XP(c)
      • P(b);EP,OGATE,P_SPINP(b),XP(B)::R(D),XP(b)
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