MESON Chess Problem Database

Problem Display
PID: 110717 (8/5p1K/3p3R/3R1nkp/8/6P1/5N1B/8 w - - 0 1)

Sonnenfeld, Pal

3rd Prize, Magyar Hirlap, 1927

8/5p1K/3p3R/3R1nkp/8/6P1/5N1B/8

#2

6 + 5

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...h4
      • 2.gxh4#
    • 1...f6
      • 2.Rg6#
  • Tries
    • 1.Bg1?
      • 1...f6
        • 2.Rg6#
      • 1...h4!
    • 1.Ra5?
      • 1...h4
        • 2.gxh4#
      • 1...f6
        • 2.Rg6#
      • 1...d5!
    • 1.Rb5?
      • 1...h4
        • 2.gxh4#
      • 1...f6
        • 2.Rg6#
      • 1...d5!
    • 1.Rxh5+?
      • 1...Kxh5
        • 2.Rxf5#
      • 1...Kf6!
  • Keys
    • 1.g4!
      • 1...Kh4
        • 2.Rxh5#
      • 1...hxg4
        • 2.Se4#
      • 1...h4
        • 2.Rxf5#
      • 1...f6
        • 2.Rxh5#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(c);OGATE::P(C),XP(c)
    • P(e);N_GUARD::R1(E)
  • Tries
    • Try
      • B(B);
      • Vars
        • P(e);N_GUARD::R1(E)
      • Refutation
        • P(c);
    • Try
      • R(D);
      • Vars
        • P(c);OGATE::P(C),XP(c)
        • P(e);N_GUARD::R1(E)
      • Refutation
        • P(d);N_SPINS(a)
    • Try
      • R(D);
      • Vars
        • P(c);OGATE::P(C),XP(c)
        • P(e);N_GUARD::R1(E)
      • Refutation
        • P(d);N_SPINS(a)
    • Try
      • R(E);CHECK,XP(c)
      • Vars
        • K(b);P-FLIGHT,XR(E)::R(D),XS(a)
      • Refutation
        • K(b);N_SPINS(a),S_FLIGHT
  • Actual
    • P(C);
    • Vars
      • K(b);N_SPINS(a),P_SPINP(c),S_FLIGHT::R1(E),XP(c)
      • P(c);SBLOCK,XP(C)::S(A)
      • P(c);::R1(D),XS(a)
      • P(e);SBLOCK::R1(E),XP(c)
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