MESON Chess Problem Database

Problem Display
PID: 2022 (8/6b1/1pp5/k1pqN3/N6Q/PP2P3/3P4/4KB2 w - - 0 1)

Lalaue, John A

Charleston Courier, 1859

(First published on Wed Aug 3 1859)

8/6b1/1pp5/k1pqN3/N6Q/PP2P3/3P4/4KB2

#2

9 + 6

1679 American Chess Nuts 1868

SOLUTION

  • SOUND
  • Sets
    • 1...Qxb3
      • 2.Sxc6#
    • 1...Qf7
      • 2.Sxc6#
    • 1...Qg8
      • 2.Sxc6#
    • 1...Qd4
      • 2.Sxc6#
    • 1...Qd8
      • 2.Sxc6#
  • Tries
    • 1.b4+?
      • 1...cxb4
        • 2.Qxb4#
      • 1...Kxa4!
  • Keys
    • 1.Qd8!
      • threat
        • 2.Qxb6#
        • 2.Qa8#
      • 1...Qxd2+
        • 2.Qxd2#
      • 1...Qxb3
        • 2.Qa8#
      • 1...Qxd8
        • 2.Sxc6#
      • 1...Qc4
        • 2.Qxb6#
      • 1...Qd3
        • 2.Qxb6#
      • 1...c4
        • 2.Qxb6#
      • 1...Qf7
        • 2.Sxc6#
        • 2.Qxb6#
      • 1...Qg8
        • 2.Sxc6#
        • 2.Qxb6#
      • 1...Qd7
        • 2.Qxb6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 3
  • Sets
    • Q(c);N_GUARD,XP(E)::S(I),XP(e)
    • Q(c);N_GUARD::S(I),XP(e)
  • Tries
    • Try
      • P(E);CHECK
      • Vars
        • P(b);OGATE,XP(E)::QAB1(H),XP(b)
      • Refutation
        • K(a);P-FLIGHT,XS(G)
  • Actual
    • Q(H);P_PINP(d)
    • Threat
      • DUALS(2)
    • Vars
      • Q(c);CHECK,OGATE,XP(C)::QAB(H),XQ(c)
      • Q(c);XP(E)::QAR(H)
      • Q(c);N_GUARD,N_SPINP(d),XQ(H)::S(I),XP(e)
      • Q(c);::QAB1(H),XP(d)
      • P(b);::QAB1(H),XP(d)
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