MESON Chess Problem Database

Problem Display
PID: 103624 (8/1n1pn3/8/1R6/rp1kNqNR/p7/3P4/KBQ5 w - - 0 1)

Konstantinopolski, S

Sahs, 1961

8/1n1pn3/8/1R6/rp1kNqNR/p7/3P4/KBQ5

#2

8 + 8

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qe3
      • 2.dxe3#
    • 1...Sa5
      • 2.Qc5#
    • 1...Sc5
      • 2.Qxc5#
    • 1...Sd6
      • 2.Qc5#
    • 1...Sd8
      • 2.Qc5#
    • 1...b3
      • 2.Qc3#
  • Tries
    • 1.Se3?
      • threat
        • 2.Qc4#
      • 1...Qxe3
        • 2.dxe3#
      • 1...Sc5
        • 2.Qxc5#
      • 1...Sd5
        • 2.Rxd5#
      • 1...Qc7
        • 2.Sd6#
      • 1...Qf1
        • 2.Sf2#
      • 1...Qf7
        • 2.Sf6#
      • 1...Sa5
        • 2.Qc5#
      • 1...Sd6
        • 2.Qc5#
      • 1...b3
        • 2.Qc3#
      • 1...d5!
    • 1.Rxb4+?
      • 1...Kd5
        • 2.Ba2#
        • 2.Qc4#
      • 1...Rxb4!
  • Keys
    • 1.Sd6!
      • threat
        • 2.Qc4#
      • 1...Qxd6
        • 2.Se5#
      • 1...Sxd6
        • 2.Qc5#
      • 1...Qf1
        • 2.Sf2#
      • 1...Qf7
        • 2.Sf6#
      • 1...Sa5
        • 2.Qc5#
      • 1...b3
        • 2.Qc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • Q(e);OGATE::P(D),XQ(e)
    • S(f);N_GUARD::QAB1(C)
    • S(f);N_GUARD::QAB1(C),XS(f)
    • P(c);N_GUARD::QAB1(C)
  • Tries
    • Try
      • S(F);
      • Threat
        • QAR1(C)
      • Vars
        • Q(e);OGATE,XS(F)::P(D),XQ(e)
        • S(f);N_GUARD::QAB1(C),XS(f)
        • S(h);N_GUARD::R1(H),XS(h)
        • Q(e);::R(G)+S(E)
        • S(f);N_GUARD::QAB1(C)
        • P(c);N_GUARD::QAB1(C)
      • Refutation
        • P(g);
    • Try
      • R(H);CHECK,XP(c)
      • Refutation
        • R(b);XR(H)
  • Actual
    • S(E);
    • Threat
      • QAR1(C)
    • Vars
      • Q(e);XS(E)::R(G)+S(F)
      • S(f);N_GUARD,XS(E)::QAB1(C)
      • Q(e);::R(G)+S(F)
      • S(f);N_GUARD::QAB1(C)
      • P(c);N_GUARD::QAB1(C)
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