MESON Chess Problem Database

Problem Display
PID: 107969 (4b3/4B3/4N2K/3pkP2/3Nnp1P/1q2bR2/3pR2Q/8 w - - 0 1)

di Scala, Pascal

1st HM., Busmen's Chess Review, 1968-1969

4b3/4B3/4N2K/3pkP2/3Nnp1P/1q2bR2/3pR2Q/8

#2

9 + 8

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Bg1
      • 2.Qxf4#
    • 1...Bf2
      • 2.Qxf4#
    • 1...Bxd4
      • 2.Qxf4#
    • 1...Sf2
      • 2.Qxf4#
    • 1...Sc3
      • 2.Qxf4#
    • 1...Sc5
      • 2.Qxf4#
    • 1...Sg5
      • 2.Qxf4#
    • 1...Sd6
      • 2.Qxf4#
    • 1...Sf6
      • 2.Qxf4#
  • Tries
    • 1.Sc6+?
      • 1...Kxf5
        • 2.Qh3#
      • 1...Bxc6!
  • Keys
    • 1.Rxf4!
      • threat
        • 2.Sf3#
      • 1...Bxf4+
        • 2.Qxf4#
      • 1...Bxd4
        • 2.Rf3#
      • 1...Bg1
        • 2.Rfxe4#
      • 1...Bf2
        • 2.Rfxe4#
      • 1...Bh5
        • 2.Sc6#
      • 1...Sg5
        • 2.Rg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 4
    • ADDED MATES = 2
    • REMOVED MATES = 5
  • Sets
    • B(c);N_GUARD,P_SPINS(d)::QAB1(B),XP(e)
    • B(c);N_GUARD,P_SPINS(d),XS(D)::QAB1(B),XP(e)
    • S(d);P_SPINB(c)::QAB1(B),XP(e)
  • Tries
    • Try
      • S(D);CHECK
      • Vars
        • K(g);P-FLIGHT,XP(F)::QAB(B)
      • Refutation
        • B(h);XS(D)
  • Actual
    • R(C);P_SPINR(C),XP(e)
    • Threat
      • S(D)
    • Vars
      • B(c);CHECK,OGATE,P_SPINB(c),P_SPINS(d),XR(C)::QAB1(B),XB(c)
      • B(c);N_PINR(C),P_SPINS(d),XS(D)::QAB(B)+R(C)
      • B(c);N_PINR(C),P_SPINS(d)::QAB(B)+R(C),DCHECK,XS(d)
      • B(h);N_GUARD::S(D)
      • S(d);N_PINR(C),P_SPINB(c)::QAB(B)+R(C)
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