MESON Chess Problem Database

Problem Display
PID: 160790 (8/b2p2K1/8/2Np3R/1PNkp1p1/4p1q1/1P2r1pB/1nR2BQ1 w - - 0 1)

Achimov, Veniamin

3rd Comm., Hlas l'udu, 1986

8/b2p2K1/8/2Np3R/1PNkp1p1/4p1q1/1P2r1pB/1nR2BQ1

#2

10 + 11

15148 Sadier Collection 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Qe1
      • 2.Be5#
    • 1...Qf2
      • 2.Be5#
    • 1...Qh4
      • 2.Be5#
    • 1...Qe5+
      • 2.Bxe5#
    • 1...Qf3
      • 2.Be5#
    • 1...Qh3
      • 2.Be5#
    • 1...Re1
      • 2.Sb3#
    • 1...Rc2
      • 2.Sb3#
    • 1...Rd2
      • 2.Sb3#
    • 1...Rf2
      • 2.Sb3#
  • Tries
    • 1.Qxe3+?
      • 1...Qxe3
        • 2.Be5#
      • 1...Rxe3!
  • Keys
    • 1.Sxe3!
      • threat
        • 2.Rxd5#
      • 1...Qe5+
        • 2.Bxe5#
      • 1...Qxe3
        • 2.Be5#
      • 1...Rxe3
        • 2.Sb3#
      • 1...Qf2
        • 2.Sf5#
      • 1...Rf2
        • 2.Sc2#
      • 1...Qd6
        • 2.Sf5#
      • 1...Sc3
        • 2.bxc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 4
    • REMOVED MATES = 7
  • Sets
    • Q(e);OGATE::B(E)
    • Q(e);N_SPINP(d),OGATE::B(E)
    • Q(e);CHECK,OGATE::B(E),XQ(e)
    • R(b);::S(H)
    • R(b);N_SPINP(d)::S(H)
  • Tries
    • Try
      • Q(C);CHECK,XP(d)
      • Vars
        • Q(e);OGATE,XQ(C)::B(E)
      • Refutation
        • R(b);XQ(C)
  • Actual
    • S(G);XP(d)
    • Threat
      • R1(I),XP(i)
    • Vars
      • Q(e);CHECK,OGATE::B(E),XQ(e)
      • Q(e);OGATE,P_SPINQ(e),XS(G)::B(E)
      • R(b);P_SPINR(b),XS(G)::S(H)
      • Q(e);::S(G)
      • R(b);::S(G)
      • Q(e);::QAB(C)+S(G),DCHECK
      • S(a);OGATE::P(D),XS(a)
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