MESON Chess Problem Database

Problem Display
PID: 121395 (3b4/8/5N1N/2QpkBpn/8/3p4/4bB2/K2n4 w - - 0 1)

Petersen, H

Deutsches Wochenschach, 1903

3b4/8/5N1N/2QpkBpn/8/3p4/4bB2/K2n4

#2

6 + 8

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kxf6
      • 2.Bd4#
    • 1...Bxf6
      • 2.Qc7#
    • 1...Sf4
      • 2.Sd7#
      • 2.Bd4#
    • 1...Sxf6
      • 2.Bg3#
  • Tries
    • 1.Bg3+?
      • 1...Kxf6
        • 2.Qf8#
      • 1...Sf4
        • 2.Sd7#
      • 1...Sxg3!
    • 1.Qxd5+?
      • 1...Kf4
        • 2.Qe4#
      • 1...Kxf6!
    • 1.Qc7+?
      • 1...Kxf6
        • 2.Bd4#
      • 1...Bxc7!
  • Keys
    • 1.Qb4!
      • threat
        • 2.Sd7#
      • 1...Kxf6
        • 2.Bd4#
      • 1...Bxf6
        • 2.Qb8#
      • 1...Sxf6
        • 2.Bg3#
      • 1...d4
        • 2.Qxd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(e);N_SPINP(d),S_FLIGHT,XS(E)::B(B)
    • B(h);N_GUARD,SBLOCK,XS(E)::QAB(C)
    • S(g);N_GUARD,SBLOCK,XS(E)::B(B)
  • Tries
    • Try
      • B(B);CHECK
      • Vars
        • K(e);N_SPINP(d),S_FLIGHT,XS(E)::QAR2(C)
        • S(g);P_SPINS(g)::S(E)
      • Refutation
        • S(g);XB(B)
    • Try
      • Q(C);CHECK,XP(d)
      • Vars
        • K(e);S_FLIGHT::QAR1(C)
      • Refutation
        • K(e);S_FLIGHT,XS(E)
    • Try
      • Q(C);CHECK,N_PINP(d)
      • Vars
        • K(e);S_FLIGHT,XS(E)::B(B)
      • Refutation
        • B(h);XQ(C)
  • Actual
    • Q(C);N_PINP(d)
    • Threat
      • S(E)
    • Vars
      • K(e);S_FLIGHT,XS(E)::B(B)
      • B(h);N_GUARD,SBLOCK,XS(E)::QAB(C)
      • S(g);N_GUARD,SBLOCK,XS(E)::B(B)
      • P(d);::QAB1(C),XP(d)
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