MESON Chess Problem Database

Problem Display
PID: 208040 (8/nQ3q2/2np1B2/1p5R/3Nkp2/2R5/3KN1P1/8 w - - 0 1)

Babson, Joseph Ney

Dubuque Chess Journal, 1873

8/nQ3q2/2np1B2/1p5R/3Nkp2/2R5/3KN1P1/8

#2

8 + 7

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qb3
      • 2.Qh7#
    • 1...Qc4
      • 2.Qh7#
    • 1...Qh7
      • 2.Qxh7#
    • 1...Qf8
      • 2.Qh7#
    • 1...f3
      • 2.Re3#
      • 2.gxf3#
  • Tries
    • 1.Qxc6+?
      • 1...Qd5
        • 2.Qxd5#
      • 1...d5
        • 2.Re5#
      • 1...Sxc6!
    • 1.Qxf7?
      • threat
        • 2.Qd5#
        • 2.Qg6#
        • 2.Qh7#
      • 1...Sxd4
        • 2.Qd5#
      • 1...Sb4
        • 2.Qe6#
        • 2.Qg6#
        • 2.Qe8#
        • 2.Qe7#
        • 2.Qh7#
      • 1...Se7
        • 2.Qe6#
        • 2.Qxe7#
      • 1...d5
        • 2.Qxd5#
        • 2.Qg6#
        • 2.Qh7#
      • 1...Se5!
  • Keys
    • 1.Rc4!
      • threat
        • 2.Sc3#
      • 1...Qxc4
        • 2.Qh7#
      • 1...b4
        • 2.Se6#
      • 1...f3
        • 2.gxf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • Q(g);OGATE::QAB(H)
    • Q(g);OGATE::QAB(H),XQ(g)
  • Tries
    • Try
      • Q(H);CHECK,XS(d)
      • Vars
        • Q(g);N_GUARD,P_PINS(E),P_SPINQ(g)::QAB1(H),XQ(g)
        • P(e);P_SPINP(e)::R1(F)
      • Refutation
        • S(f);XQ(H)
    • Try
      • Q(H);N_PINS(d),XQ(g)
      • Threat
        • DUALS(3)
      • Vars
        • S(d);XS(E)::QAB1(H)
      • Refutation
        • S(d);
  • Actual
    • R(D);
    • Threat
      • S(B)
    • Vars
      • Q(g);OGATE,XR(D)::QAB(H)
      • P(c);N_GUARD::R(D)+S(E)
      • P(b);OGATE::P(C),XP(b)
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