MESON Chess Problem Database

Problem Display
PID: 249856 (3N4/3Q2n1/1qpp2b1/1p1k4/3P4/b2P2B1/K1N5/6n1 w - - 0 1)

Nadezhdin, Nikolai Dmitrievich

Schach, 1982

3N4/3Q2n1/1qpp2b1/1p1k4/3P4/b2P2B1/K1N5/6n1

#2

7 + 9

15601 Albrecht-Leiss-Degener Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd4
      • 2.Qxc6#
    • 1...Qa5
      • 2.Qxc6#
    • 1...Qa7
      • 2.Qxc6#
    • 1...Qb8
      • 2.Qxc6#
    • 1...Bc1
      • 2.Qxd6#
    • 1...Bb2
      • 2.Qxd6#
    • 1...Sf5
      • 2.Qe6#
    • 1...Sh5
      • 2.Qe6#
    • 1...Se6
      • 2.Qxe6#
    • 1...Se8
      • 2.Qe6#
    • 1...b4
      • 2.Qxd6#
  • Tries
    • 1.Qf7+?
      • 1...Se6
        • 2.Qxe6#
      • 1...Bxf7!
  • Keys
    • 1.Qg4!
      • threat
        • 2.Se3#
      • 1...Qxd4
        • 2.Qxd4#
      • 1...Bc1
        • 2.Sb4#
      • 1...Be4
        • 2.Qxe4#
      • 1...Sf5
        • 2.Qe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 1
    • REMOVED MATES = 8
  • Sets
    • Q(e);N_GUARD,XP(E)::QAB1(F),XP(f)
    • Q(e);N_GUARD::QAB1(F),XP(f)
    • B(b);N_GUARD::QAR1(F),XP(g)
    • S(i);N_GUARD::QAB1(F)
    • S(i);N_GUARD::QAB1(F),XS(i)
    • P(c);S_CUTB(b)::QAR1(F),XP(g)
  • Tries
    • Try
      • Q(F);CHECK,N_PINP(g)
      • Vars
        • S(i);N_GUARD,P_SPINS(i)::QAB1(F),XS(i)
      • Refutation
        • B(h);XQ(F)
  • Actual
    • Q(F);N_PINP(g)
    • Threat
      • S(B)
    • Vars
      • Q(e);OGATE,XP(E)::QAR1(F),XQ(e)
      • B(b);N_GUARD::S(B)
      • B(h);N_GUARD::QAB1(F),XB(h)
      • S(i);S_CUTB(h)::QAB1(F)
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