MESON Chess Problem Database

Problem Display
PID: 234084 (8/8/3pq3/2R2N1p/Q1N3kB/1K2P1P1/6P1/2b5 w - - 0 1)

Onyschuk, Eugene

Chess Life, 1950

8/8/3pq3/2R2N1p/Q1N3kB/1K2P1P1/6P1/2b5

#2

9 + 5

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc4+
      • 2.Qxc4#
    • 1...Qd5
      • 2.Sh6#
    • 1...Qxf5
      • 2.Se5#
    • 1...Qd7
      • 2.Sh6#
    • 1...Qf7
      • 2.Sh6#
    • 1...Qc8
      • 2.Sb2#
      • 2.Sd2#
      • 2.Sa3#
      • 2.Sa5#
      • 2.Sb6#
      • 2.Scxd6#
      • 2.Sh6#
    • 1...Qg8
      • 2.Sh6#
    • 1...Qxe3+
      • 2.Scxe3#
    • 1...Qe4
      • 2.Sh6#
    • 1...Qe5
      • 2.Sh6#
    • 1...Qg6
      • 2.Sb2#
      • 2.Sd2#
      • 2.Sa3#
      • 2.Sa5#
      • 2.Sb6#
      • 2.Scxd6#
    • 1...Qh6
      • 2.Sxh6#
    • 1...Qe7
      • 2.Sh6#
    • 1...Qe8
      • 2.Sh6#
  • Keys
    • 1.Qd7!
      • threat
        • 2.Sh6#
      • 1...Qxc4+
        • 2.Rxc4#
      • 1...Qxe3+
        • 2.Sfxe3#
      • 1...Qxf5
        • 2.Qxf5#
      • 1...Bxe3
        • 2.Sxe3#
      • 1...Qh6
        • 2.Sxh6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 1
    • REMOVED MATES = 8
  • Sets
    • Q(e);CHECK,OGATE,P_SPINQ(e),XS(F)::QAR(E),XQ(e)
    • Q(e);N_GUARD::S(I)
    • Q(e);N_PINS(F),SBLOCK,XS(I)::QAR(E)+S(F),DCHECK
    • Q(e);N_GUARD,N_PINS(F)::S(I)
    • Q(e);CHECK,N_PINS(F),XP(C)::QAR(E)+S(F),DCHECK,XQ(e)
    • Q(e);N_GUARD,N_PINS(F)::S(I),XQ(e)
  • Actual
    • Q(E);
    • Threat
      • S(I)
    • Vars
      • Q(e);CHECK,OGATE,XS(F)::R(H),XQ(e)
      • Q(e);CHECK,N_PINS(F),XP(C)::QAB(E)+S(I),DCHECK,XQ(e)
      • Q(e);N_PINS(F),OGATE,P_SPINQ(e),XS(I)::QAB1(E),XQ(e)
      • B(a);XP(C)::S(I),XB(a)
      • Q(e);N_PINS(F)::QAB(E)+S(I),DCHECK,XQ(e)
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