MESON Chess Problem Database

Problem Display
PID: 17495 (4br2/2Ppk3/8/4P2B/3NQ2N/8/5R2/1K6 w - - 0 1)

Macleod, Norman Alasdair

Chess World (The), 1947

4br2/2Ppk3/8/4P2B/3NQ2N/8/5R2/1K6

#2

8 + 4

3310 2345 Chess Problems 1997

SOLUTION

  • SOUND
  • Sets
    • 1...Rf7
      • 2.Sg6#
  • Tries
    • 1.Rf7+?
      • 1...Rxf7
        • 2.Sg6#
      • 1...Bxf7!
    • 1.Qh7+?
      • 1...Rf7
        • 2.Sg6#
      • 1...Bf7!
  • Keys
    • 1.Qa8!
      • threat
        • 2.Qd8#
      • 1...Bg6+
        • 2.Sxg6#
      • 1...Rxf2
        • 2.Qxe8#
      • 1...Bxh5
        • 2.Qxf8#
      • 1...Rf3
        • 2.Qxe8#
      • 1...Rf4
        • 2.Qxe8#
      • 1...Rf5
        • 2.Qxe8#
      • 1...Rf6
        • 2.Qxe8#
      • 1...Rf7
        • 2.Sg6#
      • 1...Bf7
        • 2.Shf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 0
  • Sets
    • R(d);S_CUTB(c)::S(E)
  • Tries
    • Try
      • R(B);CHECK
      • Vars
        • R(d);SBLOCK,XR(B)::S(E)
      • Refutation
        • B(c);XR(B)
    • Try
      • Q(D);CHECK
      • Vars
        • R(d);P_SPINR(d)::S(E)
      • Refutation
        • B(c);P_SPINB(c)
  • Actual
    • Q(D);
    • Threat
      • QAB1(D)
    • Vars
      • B(c);CHECK,N_GUARD::S(E),XB(c)
      • R(d);N_GUARD,XR(B)::QAR1(D),XB(c)
      • B(c);OGATE,XB(G)::QAB1(D),XR(d)
      • R(d);N_GUARD::QAR1(D),XB(c)
      • R(d);S_CUTB(c)::S(E)
      • B(c);S_CUTR(d)::S(E)
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