MESON Chess Problem Database

Problem Display
PID: 76198 (2N5/8/8/3Q4/kpn5/8/1P6/K7 w - - 0 1)

Lincoln, Robert A

2nd Comm., Javadzade JT, 2006

2N5/8/8/3Q4/kpn5/8/1P6/K7

#2

4 + 3

145 StrateGems 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Kb3
      • 2.Qd1#
    • 1...Sd2
      • 2.Sb6#
    • 1...Sa3
      • 2.Sb6#
      • 2.b3#
    • 1...Se3
      • 2.Sb6#
    • 1...Sa5
      • 2.Sb6#
    • 1...Se5
      • 2.Sb6#
    • 1...Sb6
      • 2.Sxb6#
    • 1...Sd6
      • 2.Sb6#
  • Tries
    • 1.Ka2?
      • threat
        • 2.b3#
      • 1...Sxb2
        • 2.Sb6#
      • 1...Sd2
        • 2.Sb6#
      • 1...Sa5
        • 2.Sb6#
      • 1...b3+!
    • 1.Sb6+?
      • 1...Kb3
        • 2.Qxc4#
        • 2.Qd1#
        • 2.Qd3#
      • 1...Sxb6!
    • 1.Sd6?
      • 1...Kb3
        • 2.Qd1#
      • 1...Sxb2
        • 2.Qa2#
      • 1...Sd2
        • 2.Qa2#
      • 1...Sa3
        • 2.b3#
      • 1...Se3
        • 2.Qa2#
      • 1...Sa5
        • 2.Qa2#
      • 1...Se5
        • 2.Qa2#
      • 1...Sb6
        • 2.Qa2#
      • 1...b3
        • 2.Qb5#
      • 1...Sxd6!
    • 1.Qd7+?
      • 1...Kb3
        • 2.Qd1#
      • 1...Ka5!
  • Keys
    • 1.Sa7!
      • 1...Kb3
        • 2.Qd1#
      • 1...Sxb2
        • 2.Qa2#
      • 1...Sd2
        • 2.Qa2#
      • 1...Sa3
        • 2.b3#
      • 1...Se3
        • 2.Qa2#
      • 1...Sa5
        • 2.Qa2#
      • 1...Se5
        • 2.Qa2#
      • 1...Sb6
        • 2.Qa2#
      • 1...Sd6
        • 2.Qa2#
      • 1...b3
        • 2.Qb5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 6
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(a);P_SPINS(c),S_FLIGHT::QAB(C)
    • S(c);N_GUARD::S(D)
    • S(c);N_GUARD::S(D),XS(c)
  • Tries
    • Try
      • K(A);P-FLIGHT
      • Threat
        • P(B)
      • Vars
        • S(c);N_GUARD,XP(B)::S(D)
        • S(c);N_GUARD::S(D)
      • Refutation
        • P(b);CHECK
    • Try
      • S(D);CHECK
      • Refutation
        • S(c);XS(D)
    • Try
      • S(D);
      • Vars
        • K(a);P_SPINS(c),S_FLIGHT::QAB(C)
        • S(c);OGATE,XP(B)::QAR2(C)
        • S(c);OGATE::QAR2(C)
        • S(c);SBLOCK::P(B)
        • S(c);OGATE,SBLOCK::QAR2(C)
        • P(b);::QAB1(C)
      • Refutation
        • S(c);XS(D)
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);S_FLIGHT::QAB(C)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • S(D);
    • Vars
      • K(a);P_SPINS(c),S_FLIGHT::QAB(C)
      • S(c);OGATE,XP(B)::QAR2(C)
      • S(c);OGATE::QAR2(C)
      • S(c);SBLOCK::P(B)
      • S(c);OGATE,SBLOCK::QAR2(C)
      • P(b);::QAB1(C)
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