MESON Chess Problem Database

Problem Display
PID: 265950 (8/4p3/R2P1bK1/3pk3/1pnNPN2/2QpP1P1/3p4/1qrn3B w - - 0 1)

Mochalkin, Oleksandr Viktorovich

2nd HM., Buletin Problemistic, 1994

8/4p3/R2P1bK1/3pk3/1pnNPN2/2QpP1P1/3p4/1qrn3B

#2

10 + 11

15601 Albrecht-Leiss-Degener Collection 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qa2
      • 2.Sxd3#
    • 1...Qa1
      • 2.Sxd3#
    • 1...Qb2
      • 2.Sxd3#
    • 1...Qb3
      • 2.Sxd3#
    • 1...Rc2
      • 2.Sxd3#
    • 1...Sxd6
      • 2.Sc6#
    • 1...dxe4
      • 2.Sf3#
    • 1...exd6
      • 2.Sc6#
  • Tries
    • 1.Qxd3?
      • threat
        • 2.Sf3#
      • 1...Qxd3
        • 2.Sxd3#
      • 1...dxe4
        • 2.Sc6#
      • 1...Sb6!
    • 1.dxe7?
      • threat
        • 2.Re6#
      • 1...Sd6
        • 2.Sc6#
      • 1...Sb6!
    • 1.d7?
      • threat
        • 2.Re6#
      • 1...Sd6
        • 2.Sc6#
      • 1...e6
        • 2.Rxe6#
      • 1...Sb6!
  • Keys
    • 1.Qxb4!
      • threat
        • 2.Sc6#
      • 1...Qxb4
        • 2.Sxd3#
      • 1...Scxe3
        • 2.Sf3#
      • 1...Sxd6
        • 2.Sf3#
      • 1...Scb2
        • 2.Sf3#
      • 1...Sa3
        • 2.Sf3#
      • 1...Sa5
        • 2.Sf3#
      • 1...Sb6
        • 2.Sf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 6
    • REMOVED MATES = 7
  • Sets
    • Q(a);N_GUARD::S(G),XP(e)
    • R(b);S_CUTQ(a)::S(G),XP(e)
    • S(g);SBLOCK,XP(I)::QAB(B)+S(E),DCHECK
    • P(h);SBLOCK,XP(F)::QAB(B)+S(E),DCHECK
    • P(k);SBLOCK,XP(I)::QAB(B)+S(E),DCHECK
  • Tries
    • Try
      • Q(B);XP(e)
      • Threat
        • S(E)
      • Vars
        • Q(a);P_PINP(F),XQ(B)::S(G),XQ(a)
        • P(h);XP(F)::S(E)
      • Refutation
        • S(g);
    • Try
      • P(I);XP(k)
      • Threat
        • R1(H)
      • Vars
        • S(g);SBLOCK::QAB(B)+S(E),DCHECK
      • Refutation
        • S(g);
    • Try
      • P(I);
      • Threat
        • R1(H)
      • Vars
        • S(g);SBLOCK::QAB(B)+S(E),DCHECK
        • P(k);::R1(H),XP(k)
      • Refutation
        • S(g);
  • Actual
    • Q(B);XP(f)
    • Threat
      • S(E)
    • Vars
      • Q(a);N_GUARD,XQ(B)::S(G),XP(e)
      • S(g);XP(C)::S(E)
      • S(g);XP(I)::S(E)
      • S(g);::S(E)
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