MESON Chess Problem Database

Problem Display
PID: 219465 (n1k5/K7/8/3R4/3R4/3P4/8/8 w - - 0 1)

von Alvensleben, Wichard Udo Reinhard

Schach-Report, 1990

n1k5/K7/8/3R4/3R4/3P4/8/8

#2

4 + 2

6490 yacpdb 2020
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kc7
      • 2.Rc4#
      • 2.Rc5#
    • 1...Sb6
      • 2.Rc5#
    • 1...Sc7
      • 2.Rd8#
  • Tries
    • 1.Rb4?
      • 1...Kc7
        • 2.Rc4#
      • 1...Sc7
        • 2.Rb8#
      • 1...Sb6!
    • 1.Ra5?
      • 1...Kc7
        • 2.Rc5#
      • 1...Sb6
        • 2.Rc5#
      • 1...Sc7!
    • 1.Re5?
      • 1...Kc7
        • 2.Rc5#
      • 1...Sb6
        • 2.Rc5#
      • 1...Sc7!
    • 1.Rf5?
      • 1...Kc7
        • 2.Rc5#
      • 1...Sb6
        • 2.Rc5#
      • 1...Sc7!
    • 1.Rg5?
      • 1...Kc7
        • 2.Rc5#
      • 1...Sb6
        • 2.Rc5#
      • 1...Sc7!
    • 1.Rh5?
      • 1...Kc7
        • 2.Rc5#
      • 1...Sb6
        • 2.Rc5#
      • 1...Sc7!
    • 1.Rd6?
      • 1...Sc7
        • 2.Rd8#
      • 1...Sb6
        • 2.Rc6#
      • 1...Kc7!
    • 1.Rd7?
      • 1...Sc7
        • 2.Rd8#
      • 1...Sb6!
  • Keys
    • 1.Rb5!
      • 1...Kc7
        • 2.Rc5#
      • 1...Sc7
        • 2.Rb8#
      • 1...Sb6
        • 2.Rc5#

This anticipates 219467(1991)

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::R(C)
    • S(a);SBLOCK::R1(C)
  • Tries
    • Try
      • R(B);
      • Vars
        • K(b);P-FLIGHT::R(B)
        • S(a);SBLOCK::R1(B)
      • Refutation
        • S(a);
    • Try
      • R(C);
      • Vars
        • K(b);P-FLIGHT::R(C)
        • S(a);N_GUARD::R(C)
      • Refutation
        • S(a);
    • Try
      • R(C);
      • Vars
        • K(b);P-FLIGHT::R(C)
        • S(a);N_GUARD::R(C)
      • Refutation
        • S(a);
    • Try
      • R(C);
      • Vars
        • K(b);P-FLIGHT::R(C)
        • S(a);N_GUARD::R(C)
      • Refutation
        • S(a);
    • Try
      • R(C);
      • Vars
        • K(b);P-FLIGHT::R(C)
        • S(a);N_GUARD::R(C)
      • Refutation
        • S(a);
    • Try
      • R(C);
      • Vars
        • K(b);P-FLIGHT::R(C)
        • S(a);N_GUARD::R(C)
      • Refutation
        • S(a);
    • Try
      • R(C);
      • Vars
        • S(a);SBLOCK::R1(C)
        • S(a);N_GUARD::R(C)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • R(C);
      • Vars
        • S(a);SBLOCK::R1(C)
      • Refutation
        • S(a);
  • Actual
    • R(C);
    • Vars
      • K(b);P-FLIGHT::R(C)
      • S(a);SBLOCK::R1(C)
      • S(a);N_GUARD::R(C)
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