MESON Chess Problem Database

Problem Display
PID: 18672 (8/1R6/3p4/pN1p4/1k6/8/2K5/2RB4 w - - 0 1)

Lipton, Michael

5th HM., Probleemblad, 1957

8/1R6/3p4/pN1p4/1k6/8/2K5/2RB4

#2

5 + 4

3976 FIDE Album (1956-1958) 1961
3174 The Two-move Chess Problem Tradition and Development 1966

SOLUTION

  • SOUND
  • Sets
    • 1...Ka4
      • 2.Kc3#
    • 1...Kc5
      • 2.Kb3#
  • Tries
    • 1.Kb2?
      • threat
        • 2.Sa3#
        • 2.Sd4#
        • 2.Sxd6#
        • 2.Sa7#
        • 2.Sc7#
      • 1...d4
        • 2.Sa3#
        • 2.Sxd4#
        • 2.Sxd6#
        • 2.Sa7#
        • 2.Sc7#
      • 1...a4!
    • 1.Kd3?
      • 1...d4
        • 2.Rc4#
      • 1...a4!
    • 1.Sd4+?
      • 1...Ka3
        • 2.Ra1#
      • 1...Ka4
        • 2.Kb2#
        • 2.Ra1#
      • 1...Kc5
        • 2.Kd3#
      • 1...Kc4!
    • 1.Sxd6+?
      • 1...Ka3
        • 2.Ra1#
      • 1...Ka4
        • 2.Kb2#
        • 2.Ra1#
      • 1...Kc5!
    • 1.Sa7+?
      • 1...Ka3
        • 2.Ra1#
      • 1...Ka4
        • 2.Kb2#
        • 2.Ra1#
      • 1...Kc5
        • 2.Kd3#
      • 1...Kc4!
    • 1.Sc7+?
      • 1...Ka3
        • 2.Ra1#
      • 1...Ka4
        • 2.Kb2#
        • 2.Ra1#
      • 1...Kc5
        • 2.Kd3#
      • 1...Kc4!
    • 1.Rb1+?
      • 1...Ka4
        • 2.Kc1#
        • 2.Kd2#
        • 2.Kc3#
        • 2.Kd3#
      • 1...Kc4
        • 2.Rc7#
      • 1...Kc5!
  • Keys
    • 1.Sa3+!
      • 1...Kxa3
        • 2.Ra1#
      • 1...Ka4
        • 2.Kb2#
      • 1...Kc5
        • 2.Kd3#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(a);P-FLIGHT::B(B)+K(C)
    • K(a);S_FLIGHT::R(A)+K(C)
  • Tries
    • Try
      • K(C);P-FLIGHT
      • Threat
        • DUALS(5)
      • Refutation
        • P(b);
    • Try
      • K(C);S_FLIGHT
      • Vars
        • P(c);N_GUARD::R1(A)
      • Refutation
        • P(b);
    • Try
      • S(D);CHECK
      • Vars
        • K(a);S_FLIGHT::R(A)
        • K(a);S_FLIGHT::R(A)+K(C)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • S(D);CHECK,XP(d)
      • Vars
        • K(a);S_FLIGHT::R(A)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • S(D);CHECK
      • Vars
        • K(a);S_FLIGHT::R(A)
        • K(a);S_FLIGHT::R(A)+K(C)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • S(D);CHECK
      • Vars
        • K(a);S_FLIGHT::R(A)
        • K(a);S_FLIGHT::R(A)+K(C)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • R(A);CHECK
      • Vars
        • K(a);P-FLIGHT::R(E)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • S(D);CHECK
    • Vars
      • K(a);S_FLIGHT,XS(D)::R(A)
      • K(a);P-FLIGHT::B(B)+K(C)
      • K(a);S_FLIGHT::R(A)+K(C)
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