MESON Chess Problem Database

Problem Display
PID: 102504 (KR1n4/1n6/1k6/4Q3/1N6/8/8/8 w - - 0 1)

Kovacs, Nandor

L'Echiquier Marseillais, 1925

KR1n4/1n6/1k6/4Q3/1N6/8/8/8

#2

4 + 3

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sc6
      • 2.Rxb7#
    • 1...Se6
      • 2.Rxb7#
    • 1...Sf7
      • 2.Rxb7#
  • Tries
    • 1.Qd5?
      • 1...Sc6
        • 2.Rxb7#
      • 1...Se6
        • 2.Rxb7#
      • 1...Sf7
        • 2.Rxb7#
      • 1...Kc7!
    • 1.Qf5?
      • 1...Sc6
        • 2.Rxb7#
      • 1...Se6
        • 2.Rxb7#
      • 1...Sf7
        • 2.Rxb7#
      • 1...Kc7!
    • 1.Qg5?
      • 1...Sc6
        • 2.Rxb7#
      • 1...Se6
        • 2.Rxb7#
      • 1...Sf7
        • 2.Rxb7#
      • 1...Kc7!
    • 1.Qh5?
      • 1...Sc6
        • 2.Rxb7#
      • 1...Se6
        • 2.Rxb7#
      • 1...Sf7
        • 2.Rxb7#
      • 1...Kc7!
  • Keys
    • 1.Rc8!
      • 1...Sc5
        • 2.Qxc5#
      • 1...Sa5
        • 2.Qc5#
      • 1...Sd6
        • 2.Qc5#
      • 1...Sc6
        • 2.Rxc6#
      • 1...Se6
        • 2.Rc6#
      • 1...Sf7
        • 2.Rc6#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 3
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • S(c);N_GUARD::R1(D),XS(b)
  • Tries
    • Try
      • Q(B);
      • Vars
        • S(c);N_GUARD::R1(D),XS(b)
      • Refutation
        • K(a);N_SPINS(b),S_FLIGHT
    • Try
      • Q(B);
      • Vars
        • S(c);N_GUARD::R1(D),XS(b)
      • Refutation
        • K(a);N_SPINS(b),S_FLIGHT
    • Try
      • Q(B);
      • Vars
        • S(c);N_GUARD::R1(D),XS(b)
      • Refutation
        • K(a);N_SPINS(b),S_FLIGHT
    • Try
      • Q(B);
      • Vars
        • S(c);N_GUARD::R1(D),XS(b)
      • Refutation
        • K(a);N_SPINS(b),S_FLIGHT
  • Actual
    • R(D);N_PINS(b)
    • Vars
      • S(b);N_GUARD::QAB1(B),XS(b)
      • S(b);N_GUARD::QAB1(B)
      • S(c);N_GUARD::R1(D),XS(c)
      • S(c);N_GUARD::R1(D)
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