MESON Chess Problem Database

Problem Display
PID: 39627 (8/8/8/8/4Nn2/3p2Qn/3K1N2/5k2 w - - 0 1)

Neyndorff, Luke

StrateGems, 2001

8/8/8/8/4Nn2/3p2Qn/3K1N2/5k2

#2

4 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Sxf2
      • 2.Qxf2#
  • Tries
    • 1.Kd1?
      • threat
        • 2.Sd2#
      • 1...Sxf2+
        • 2.Qxf2#
      • 1...d2
        • 2.Sxd2#
      • 1...Sg2!
    • 1.Sxh3?
      • threat
        • 2.Qf2#
        • 2.Qg1#
        • 2.Qf3#
      • 1...Se2
        • 2.Qf2#
        • 2.Qf3#
      • 1...Sg2
        • 2.Qf2#
        • 2.Qxd3#
        • 2.Qf3#
      • 1...Sxh3!
    • 1.Sg4?
      • threat
        • 2.Sh2#
        • 2.Se3#
      • 1...Sd5
        • 2.Sh2#
      • 1...Sg2!
    • 1.Qxh3+?
      • 1...Kg1
        • 2.Qh1#
      • 1...Sg2
        • 2.Qh1#
      • 1...Sxh3!
  • Keys
    • 1.Qf3!
      • threat
        • 2.Sxh3#
      • 1...Kg1
        • 2.Qh1#
      • 1...Sxf2
        • 2.Qxf2#
      • 1...Sg1
        • 2.Sg3#
      • 1...Sg5
        • 2.Qh1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • S(c);OGATE,XS(B)::QAR1(C),XS(c)
  • Tries
    • Try
      • K(A);P-FLIGHT
      • Threat
        • S(D)
      • Vars
        • S(c);CHECK,OGATE,XS(B)::QAR1(C),XS(c)
        • P(b);::S(D),XP(b)
      • Refutation
        • S(d);
    • Try
      • S(B);XS(c)
      • Threat
        • DUALS(3)
      • Refutation
        • S(d);XS(B)
    • Try
      • S(B);
      • Threat
        • DUALS(2)
      • Vars
        • S(d);::S(B)
      • Refutation
        • S(d);
    • Try
      • Q(C);CHECK,XS(c)
      • Vars
        • K(a);P-FLIGHT::QAR1(C)
        • S(d);P_SPINS(d)::QAR2(C)
      • Refutation
        • S(d);XQ(C)
  • Actual
    • Q(C);
    • Threat
      • QAR(C)+S(B),XS(c)
    • Vars
      • K(a);P-FLIGHT::QAR1(C)
      • S(c);OGATE,P_SPINS(c),XS(B)::QAR1(C),XS(c)
      • S(c);SBLOCK::S(D)
      • S(c);N_GUARD::QAR2(C)
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