MESON Chess Problem Database

Problem Display
PID: 44328 (1R6/1nNB2p1/1kPn2K1/1N6/1B6/8/8/8 w - - 0 1)

Boswell, Edward

The Problemist, 1929

1R6/1nNB2p1/1kPn2K1/1N6/1B6/8/8/8

#2

7 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Sc4
      • 2.Rxb7#
    • 1...Se4
      • 2.Rxb7#
    • 1...Sxb5
      • 2.Rxb7#
    • 1...Sf5
      • 2.Rxb7#
    • 1...Sf7
      • 2.Rxb7#
    • 1...Sc8
      • 2.Rxb7#
    • 1...Se8
      • 2.Rxb7#
  • Tries
    • 1.Sxd6?
      • threat
        • 2.Rxb7#
      • 1...Ka7
        • 2.Rxb7#
      • 1...Kxc7!
    • 1.Bc5+?
      • 1...Ka5
        • 2.Ra8#
      • 1...Kxc5!
    • 1.Be8?
      • 1...Sxb5
        • 2.Rxb7#
      • 1...Sc4
        • 2.Rxb7#
      • 1...Se4
        • 2.Rxb7#
      • 1...Sf5
        • 2.Rxb7#
      • 1...Sf7
        • 2.Rxb7#
      • 1...Sc8
        • 2.Rxb7#
      • 1...Sxe8!
  • Keys
    • 1.Ra8!
      • threat
        • 2.Ra6#
      • 1...Sxb5
        • 2.Sd5#
      • 1...Sc5
        • 2.Ba5#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 6
  • Sets
    • S(b);N_GUARD::R1(G),XS(c)
    • S(b);N_GUARD,XS(B)::R1(G),XS(c)
  • Tries
    • Try
      • S(B);XS(b)
      • Threat
        • R1(G),XS(c)
      • Vars
        • K(a);N_SPINS(c),S_FLIGHT::R1(G),XS(c)
      • Refutation
        • K(a);N_SPINS(c),S_FLIGHT,XS(E)
    • Try
      • B(A);CHECK
      • Vars
        • K(a);N_SPINS(c),S_FLIGHT::R(G)
      • Refutation
        • K(a);N_SPINS(c),S_FLIGHT,XB(A)
    • Try
      • B(F);
      • Vars
        • S(b);N_GUARD,XS(B)::R1(G),XS(c)
        • S(b);N_GUARD::R1(G),XS(c)
      • Refutation
        • S(b);XB(F)
  • Actual
    • R(G);N_PINS(c)
    • Threat
      • R1(G)
    • Vars
      • S(b);SBLOCK,XS(B)::S(E)
      • S(c);N_GUARD,SBLOCK::B(A)
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