MESON Chess Problem Database

Problem Display
PID: 103330 (3RrN2/K3p3/p6B/r3knPR/3pP3/Q6p/3n1Npq/8 w - - 0 1)

Macs, Valdemar

Riga-750 JT, 1951

3RrN2/K3p3/p6B/r3knPR/3pP3/Q6p/3n1Npq/8

#2

9 + 11

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kf4
      • 2.Sg6#
    • 1...Qf4
      • 2.Qxa5#
    • 1...Sxe4
      • 2.Sd3#
    • 1...e6
      • 2.Sg6#
  • Tries
    • 1.Bg7+?
      • 1...Kf4
        • 2.Se6#
        • 2.Sg6#
      • 1...Sxg7!
    • 1.Rd5+?
      • 1...Kf4
        • 2.Se6#
        • 2.Sg6#
      • 1...Rxd5!
  • Keys
    • 1.g6!
      • threat
        • 2.Rxf5#
      • 1...Kf6
        • 2.Sg4#
      • 1...Rxf8
        • 2.Qxe7#
      • 1...Sxe4
        • 2.Sg4#
      • 1...Qf4
        • 2.Bg7#
      • 1...e6
        • 2.Sd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • K(g);S_FLIGHT::S(I)
    • Q(c);SBLOCK::QAR(B),XR(f)
    • S(a);SBLOCK,XP(C)::S(A)
    • P(j);SBLOCK::S(I)
  • Tries
    • Try
      • B(F);CHECK
      • Refutation
        • S(h);XB(F)
    • Try
      • R(H);CHECK
      • Refutation
        • R(f);XR(H)
  • Actual
    • P(D);P_PINS(h)
    • Threat
      • R1(E),XS(h)
    • Vars
      • K(g);N_SPINS(h),S_FLIGHT::S(A)
      • R(k);N_GUARD,XS(I)::QAR2(B),XP(j)
      • S(a);SBLOCK,XP(C)::S(A)
      • Q(c);SBLOCK::B(F)
      • P(j);SBLOCK::S(I)
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