MESON Chess Problem Database

Problem Display
PID: 45315 (1K6/3Pp3/R1P1p3/r1kpp3/p1NpP3/N7/8/1R6 w - - 0 1)

Ruppin, Raffi

1st Prize, Problem 036. TT, 1961

1K6/3Pp3/R1P1p3/r1kpp3/p1NpP3/N7/8/1R6

#2

8 + 8

3841 The Art of Israeli Chess Composition 1983
56 The Problemist 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Rb5+
      • 2.Rxb5#
  • Tries
    • 1.Kc7?
      • threat
        • 2.Rxa5#
      • 1...Rxa6
        • 2.Rb5#
      • 1...Rb5
        • 2.Rxb5#
      • 1...d3!
    • 1.d8Q?
      • threat
        • 2.Qxa5#
        • 2.Qb6#
        • 2.Qxe7#
      • 1...Rb5+
        • 2.Rxb5#
      • 1...dxc4
        • 2.Qxe7#
      • 1...dxe4
        • 2.Qxa5#
      • 1...d3
        • 2.Qb6#
      • 1...Rxa6!
  • Keys
    • 1.d8S!
      • threat
        • 2.Sxe6#
        • 2.Sb7#
        • 2.Rxa5#
      • 1...Rb5+
        • 2.Rxb5#
      • 1...Rxa6
        • 2.Rb5#
      • 1...dxc4
        • 2.Sb7#
      • 1...dxe4
        • 2.Rxa5#
      • 1...d3
        • 2.Sxe6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • R(c);CHECK,N_GUARD::R1(A),XR(c)
  • Tries
    • Try
      • K(H);S_FLIGHT
      • Threat
        • R(E),XR(c)
      • Vars
        • R(c);N_GUARD,XR(E)::R1(A)
        • R(c);N_GUARD::R1(A),XR(c)
      • Refutation
        • P(b);
    • Try
      • P(G);
      • Threat
        • DUALS(3)
      • Vars
        • R(c);CHECK,N_GUARD::R1(A),XR(c)
        • P(e);XS(C)::QAB(G),XP(h)
        • P(e);XP(D)::QAR2(G),XR(c)
        • P(b);::QAB1(G)
      • Refutation
        • R(c);XR(E)
  • Actual
    • P(G);
    • Threat
      • DUALS(3)
    • Vars
      • R(c);CHECK,N_GUARD::R1(A),XR(c)
      • R(c);N_GUARD,XR(E)::R1(A)
      • P(e);XS(C)::S(G)
      • P(e);XP(D)::R(E),XR(c)
      • P(b);::S(G),XP(g)
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