MESON Chess Problem Database

Problem Display
PID: 265293 (4N2k/5K2/3pp1B1/1p2qp1N/5p2/2Q5/8/8 w - - 0 1)

Castellari, Umberto

3rd HM., Correspondence Chess, 1958

4N2k/5K2/3pp1B1/1p2qp1N/5p2/2Q5/8/8

#2

5 + 7

15601 Albrecht-Leiss-Degener Collection 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qf6+
      • 2.Qxf6#
    • 1...Qg7+
      • 2.Qxg7#
    • 1...d5
      • 2.Qxe5#
  • Tries
    • 1.Sxf4?
      • threat
        • 2.Qh3#
      • 1...Qf6+
        • 2.Qxf6#
      • 1...Qg7+
        • 2.Qxg7#
      • 1...Qxc3!
    • 1.Sxd6?
      • threat
        • 2.Qxe5#
        • 2.Qc8#
      • 1...Qf6+
        • 2.Qxf6#
      • 1...Qg7+
        • 2.Qxg7#
      • 1...Qd4
        • 2.Qc8#
      • 1...Qxc3!
    • 1.Qh3?
      • threat
        • 2.Sg3#
        • 2.Sxf4#
        • 2.Shf6#
        • 2.Shg7#
      • 1...Qf6+
        • 2.Shxf6#
      • 1...Qg7+
        • 2.Shxg7#
      • 1...Qc3
        • 2.Sg3#
      • 1...Qe1
        • 2.Sg3#
      • 1...Qe3
        • 2.Sg3#
      • 1...f3
        • 2.Sg3#
        • 2.Sf4#
        • 2.Shf6#
        • 2.Shg7#
      • 1...Qe2!
  • Keys
    • 1.Qc8!
      • threat
        • 2.Sxd6#
        • 2.Sef6#
        • 2.Sc7#
        • 2.Seg7#
      • 1...Qf6+
        • 2.Sexf6#
      • 1...Qg7+
        • 2.Sexg7#
      • 1...Qc3
        • 2.Sc7#
      • 1...Qc5
        • 2.Sc7#
      • 1...d5
        • 2.Sd6#
        • 2.Sef6#
        • 2.Sc7#
        • 2.Seg7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • Q(c);CHECK,OGATE::QAB(A),XQ(c)
    • Q(c);CHECK,OGATE::QAB1(A),XQ(c)
    • P(e);N_GUARD::QAB(A),XQ(c)
  • Tries
    • Try
      • S(B);XP(a)
      • Threat
        • QAR(A)
      • Vars
        • Q(c);CHECK,OGATE::QAB(A),XQ(c)
        • Q(c);CHECK,OGATE::QAB1(A),XQ(c)
      • Refutation
        • Q(c);N_SPINQ(c),XQ(A)
    • Try
      • S(E);XP(e)
      • Threat
        • DUALS(2)
      • Vars
        • Q(c);CHECK,OGATE::QAB(A),XQ(c)
        • Q(c);CHECK,OGATE::QAB1(A),XQ(c)
        • Q(c);::QAR(A)
      • Refutation
        • Q(c);N_SPINQ(c),XQ(A)
    • Try
      • Q(A);N_PINQ(c)
      • Threat
        • DUALS(4)
      • Vars
        • Q(c);CHECK::QAR(A)+S(B),XQ(c)
        • Q(c);::QAR(A)+S(B)
      • Refutation
        • Q(c);
  • Actual
    • Q(A);N_PINQ(c)
    • Threat
      • DUALS(4)
    • Vars
      • Q(c);CHECK::QAR(A)+S(E),XQ(c)
      • Q(c);::QAR(A)+S(E)
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