MESON Chess Problem Database

Problem Display
PID: 287576 (Q7/2K3pN/2P1p3/4k2p/1NR3rr/3B4/3B4/7b w - - 0 1)

van der Straat, Frits P

Probleemblad, 1959

Q7/2K3pN/2P1p3/4k2p/1NR3rr/3B4/3B4/7b

#2

8 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Rg2
      • 2.Qa5#
    • 1...Re4
      • 2.Qa5#
    • 1...g5
      • 2.Qh8#
    • 1...g6
      • 2.Qh8#
  • Tries
    • 1.Be4?
      • threat
        • 2.Sd3#
        • 2.Qa1#
        • 2.Qa5#
      • 1...Rxe4
        • 2.Qa5#
      • 1...Rg1
        • 2.Sd3#
        • 2.Qa5#
      • 1...Rg3
        • 2.Qa5#
      • 1...Rh3
        • 2.Qa5#
      • 1...Bxe4!
    • 1.Qd8?
      • threat
        • 2.Qd6#
      • 1...Re4
        • 2.Rc5#
        • 2.Qg5#
      • 1...Rd4
        • 2.Qg5#
      • 1...Be4!
  • Keys
    • 1.Qf8!
      • threat
        • 2.Qd6#
      • 1...Rd4
        • 2.Qxg7#
      • 1...Re4
        • 2.Qc5#
      • 1...Be4
        • 2.Bc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • R(b);S_CUTB(a)::QAR(H)
    • P(g);OGATEB::QAB(H)
  • Tries
    • Try
      • B(B);
      • Threat
        • DUALS(3)
      • Vars
        • R(b);XB(B)::QAR(H)
        • R(b);::QAR(H)
        • R(c);::QAR(H)
      • Refutation
        • B(a);XB(B)
    • Try
      • Q(H);
      • Threat
        • QAB1(H)
      • Vars
        • R(b);N_GUARD::QAR2(H)
      • Refutation
        • B(a);
  • Actual
    • Q(H);
    • Threat
      • QAB1(H)
    • Vars
      • R(b);N_GUARD::QAB(H),XP(g)
      • R(b);S_CUTB(a)::QAR2(H)
      • B(a);S_CUTR(b)::B(A)
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