MESON Chess Problem Database

Problem Display
PID: 50521 (4N3/4p3/2P1p3/4k3/Rn1N4/4p1PK/1Qn5/2B4B w - - 0 1)

Lider, Valentin Viktorovich

Comm., Het Belgisch Schaakbord (L'Echiquier Belge), 1983-1984

4N3/4p3/2P1p3/4k3/Rn1N4/4p1PK/1Qn5/2B4B

#2

9 + 6

5110 Bekroonde Problemen 2002

SOLUTION

  • SOUND
  • Sets
    • 1...Sa2
      • 2.Ra5#
      • 2.Qb5#
      • 2.Qb8#
    • 1...Sd3
      • 2.Qb8#
    • 1...Sxc6
      • 2.Qb5#
    • 1...e2
      • 2.Bf4#
  • Tries
    • 1.Kg4?
      • threat
        • 2.Sxc2#
      • 1...Sxc6
        • 2.Sxc6#
        • 2.Qb5#
      • 1...Sa1
        • 2.Sc2#
        • 2.Se2#
        • 2.Sb3#
        • 2.Sb5#
        • 2.Sf5#
      • 1...Se1
        • 2.Sc2#
        • 2.Se2#
        • 2.Sb3#
        • 2.Sb5#
        • 2.Sf5#
      • 1...Sa3
        • 2.Sc2#
        • 2.Se2#
        • 2.Sb3#
        • 2.Sb5#
        • 2.Sf5#
      • 1...Sa2
        • 2.Ra5#
        • 2.Qb5#
        • 2.Qb8#
      • 1...Sd3
        • 2.Qb8#
      • 1...Sd5
        • 2.Sf3#
      • 1...Sxd4!
    • 1.Qxb4?
      • threat
        • 2.Ra5#
        • 2.Qa5#
        • 2.Qc5#
        • 2.Qb5#
        • 2.Qb8#
      • 1...Sxd4
        • 2.Qc5#
      • 1...Sa3
        • 2.Qc5#
        • 2.Qb8#
      • 1...Sxb4!
  • Keys
    • 1.g4!
      • 1...Kf4
        • 2.Sxe6#
      • 1...Sxd4
        • 2.Qh2#
      • 1...Sxc6
        • 2.Sxc6#
      • 1...Sa1
        • 2.Se2#
      • 1...Se1
        • 2.Se2#
      • 1...Sa3
        • 2.Se2#
      • 1...Sa2
        • 2.Qb8#
      • 1...Sd3
        • 2.Qb8#
      • 1...Sd5
        • 2.Sf3#
      • 1...Sa6
        • 2.Sxc2#
      • 1...e2
        • 2.Sxc2#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 8
    • REMOVED MATES = 0
  • Sets
    • S(c);OGATE::QAB(C)
    • S(c);OGATE,XP(H)::QAR(C)
    • P(b);OGATE::B(A)
  • Tries
    • Try
      • K(E);S_FLIGHT
      • Threat
        • QAB(C)+S(G),XS(a)
      • Vars
        • S(c);OGATE::QAB(C)
        • S(c);SBLOCK::QAB(C)+S(G),DCHECK
      • Refutation
        • S(a);P_SPINS(a),XS(G)
    • Try
      • Q(C);XS(c)
      • Threat
        • DUALS(5)
      • Vars
        • S(a);XS(G)::QAR2(C)
      • Refutation
        • S(a);XQ(C)
  • Actual
    • P(D);
    • Vars
      • K(d);P_SPINP(b),S_FLIGHT::S(G),XP(e)
      • S(a);OGATE,P_SPINS(a),SBLOCK,XS(G)::QAB(C)
      • S(c);XP(H)::QAB(C)+S(G),DCHECK,XS(c)
      • S(a);N_GUARD::QAB(C)+S(G)
      • S(c);OGATE::QAB(C)
      • S(c);SBLOCK::QAB(C)+S(G),DCHECK
      • S(c);::QAB(C)+S(G),XS(a)
      • P(b);::QAB(C)+S(G),XS(a)
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