MESON Chess Problem Database

Problem Display
PID: 199811 (3r1Rb1/6p1/2B2p2/r2N4/6p1/R1N2kB1/q2Pp2K/8 w - - 0 1)

Lipton, Michael

Die Schwalbe, 2019

3r1Rb1/6p1/2B2p2/r2N4/6p1/R1N2kB1/q2Pp2K/8

#2

8 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...f5
      • 2.Rxf5#
    • 1...g5
      • 2.Rxf6#
    • 1...g6
      • 2.Rxf6#
  • Tries
    • 1.Se4+?
      • 1...Qb3
        • 2.Sg5#
      • 1...Qxa3
        • 2.Sg5#
      • 1...Rxa3
        • 2.Sg5#
      • 1...Kxe4!
  • Keys
    • 1.Sxf6+!
      • 1...Qd5
        • 2.Sa4#
      • 1...Rad5
        • 2.Sxa2#
      • 1...Rdd5
        • 2.Sxg8#
      • 1...Bd5
        • 2.Se8#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • P(f);OGATE::R(H),XP(f)
    • P(g);N_GUARD::R(H),XP(f)
  • Tries
    • Try
      • S(D);CHECK
      • Vars
        • Q(a);P_SPINQ(a)::S(D)
        • Q(a);XR(C)::S(D)
        • R(e);XR(C)::S(D)
      • Refutation
        • K(c);N_SPINP(f),S_FLIGHT,XS(D)
  • Actual
    • S(F);CHECK,XP(f)
    • Vars
      • Q(a);P_SPINQ(a)::R(C)+S(D)
      • R(e);P_SPINR(e)::R(C)+S(D),XQ(a)
      • R(h);P_SPINR(h)::R(H)+S(F),XB(i)
      • B(i);P_SPINB(i)::R(H)+S(F)
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