MESON Chess Problem Database

Problem Display
PID: 226585 (4b2N/8/3p3p/3Qn2k/2p1BK2/4ppP1/4q3/8 w - - 0 1)

Semerad, Bohumil

Tidskrift for Schack, 1910

4b2N/8/3p3p/3Qn2k/2p1BK2/4ppP1/4q3/8

#2

5 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qd3
      • 2.Bxf3#
    • 1...Qe1
      • 2.Bxf3#
    • 1...Qa2
      • 2.Bxf3#
    • 1...Qb2
      • 2.Bxf3#
    • 1...Qc2
      • 2.Bxf3#
    • 1...Qd2
      • 2.Bxf3#
    • 1...Qh2
      • 2.Bxf3#
    • 1...Ba4
      • 2.Bg6#
    • 1...Bb5
      • 2.Bg6#
    • 1...Bc6
      • 2.Bg6#
    • 1...Bg6
      • 2.Bxg6#
    • 1...Bd7
      • 2.Bg6#
  • Tries
    • 1.Qf7+?
      • 1...Sg6+
        • 2.Bxg6#
      • 1...Sxf7
        • 2.Bg6#
      • 1...Bxf7!
  • Keys
    • 1.Bf5!
      • threat
        • 2.Bg4#
      • 1...Sd3+
        • 2.Bxd3#
      • 1...Sg6+
        • 2.Bxg6#
      • 1...Bd7
        • 2.Bg6#
      • 1...Sg4
        • 2.Bxg4#
        • 2.Bg6#
      • 1...f2
        • 2.Qh1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 11
  • Sets
    • Q(a);N_GUARD::B(B),XP(c)
    • Q(a);N_GUARD,P_PINP(A)::B(B),XP(c)
    • B(i);N_GUARD::B(B)
    • B(i);N_GUARD::B(B),XB(i)
  • Tries
    • Try
      • Q(D);CHECK,N_PINS(e)
      • Vars
        • S(e);CHECK,N_GUARD,P_SPINS(e)::B(B),XS(e)
        • S(e);N_GUARD,XQ(D)::B(B)
      • Refutation
        • B(i);XQ(D)
  • Actual
    • B(B);N_PINS(e)
    • Threat
      • B(B)
    • Vars
      • S(e);CHECK,OGATEB::QAR(D)+B(B),XS(e)
      • S(e);CHECK::QAR(D)+B(B),DCHECK,XS(e)
      • B(i);N_GUARD::B(B)
      • P(c);OGATE::QAR(D)
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Developed and maintained by Brian Stephenson.
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