MESON Chess Problem Database

Problem Display
PID: 205528 (R7/R7/n7/p7/k1K5/8/1P6/8 w - - 0 1)

Pape, Edouard

L'Echiquier Marseillais, 1925

R7/R7/n7/p7/k1K5/8/1P6/8

#2

4 + 3

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sb4
      • 2.Rxa5#
    • 1...Sc5
      • 2.Rxa5#
    • 1...Sc7
      • 2.Rxa5#
    • 1...Sb8
      • 2.Rxa5#
  • Tries
    • 1.Kc3?
      • 1...Sb4
        • 2.Rxa5#
      • 1...Sc5
        • 2.Rxa5#
      • 1...Sc7
        • 2.Rxa5#
      • 1...Sb8
        • 2.Rxa5#
      • 1...Kb5!
    • 1.Rb8?
      • 1...Sb4
        • 2.Rxb4#
      • 1...Sc5
        • 2.Rb4#
      • 1...Sc7
        • 2.Rb4#
      • 1...Sxb8!
    • 1.b4?
      • 1...Sxb4
        • 2.Rxa5#
      • 1...axb4
        • 2.Rxa6#
      • 1...Sc5
        • 2.Rxa5#
      • 1...Sc7
        • 2.Rxa5#
      • 1...Sb8
        • 2.Rxa5#
      • 1...Ka3!
  • Keys
    • 1.Rb7!
      • 1...Sb4
        • 2.Rxb4#
      • 1...Sc5
        • 2.Rb4#
      • 1...Sc7
        • 2.Rb4#
      • 1...Sb8
        • 2.Rb4#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 4
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • S(c);OGATE,P_SPINP(b)::R1(C),XP(b)
  • Tries
    • Try
      • K(B);P-FLIGHT
      • Vars
        • S(c);OGATE,P_SPINP(b)::R1(C),XP(b)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • R(D);
      • Vars
        • S(c);N_GUARD,P_SPINP(b)::R1(D),XS(c)
        • S(c);N_GUARD,P_SPINP(b)::R1(D)
      • Refutation
        • S(c);P_SPINP(b),XR(D)
    • Try
      • P(A);
      • Vars
        • S(c);OGATE,P_SPINP(b),XP(A)::R1(C),XP(b)
        • P(b);OGATEB,P_SPINS(c),XP(A)::R(C),XS(c)
        • S(c);OGATE,P_SPINP(b)::R1(C),XP(b)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • R(C);
    • Vars
      • S(c);N_GUARD,P_SPINP(b)::R1(C),XS(c)
      • S(c);N_GUARD,P_SPINP(b)::R1(C)
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