MESON Chess Problem Database

Problem Display
PID: 144578 (8/bKQ3nr/p4R2/1N4Bp/1n2k2r/8/B1P3P1/8 w - - 0 1)

Engberg, EW

British Chess Magazine, 1899

8/bKQ3nr/p4R2/1N4Bp/1n2k2r/8/B1P3P1/8

#2

8 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Rh1
      • 2.Qf4#
    • 1...Rh2
      • 2.Qf4#
    • 1...Rh3
      • 2.Qf4#
    • 1...Rf4
      • 2.Qxf4#
    • 1...Sf5
      • 2.Re6#
  • Tries
    • 1.Rf4+?
      • 1...Rxf4
        • 2.Qxf4#
      • 1...Ke3!
    • 1.Qc4+?
      • 1...Bd4
        • 2.Qxd4#
      • 1...Ke5!
  • Keys
    • 1.Bf4!
      • threat
        • 2.Qe5#
      • 1...Rxf4
        • 2.Qxf4#
      • 1...Sxc2
        • 2.Qxc2#
      • 1...Bd4
        • 2.Sd6#
      • 1...Bb8
        • 2.Qc4#
      • 1...Sd3
        • 2.Qc6#
      • 1...Sc6
        • 2.Qxc6#
      • 1...Sf5
        • 2.Re6#
      • 1...Se6
        • 2.Qxh7#
      • 1...Se8
        • 2.Qxh7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 3
  • Sets
    • R(c);N_GUARD::QAR1(H)
    • R(c);N_GUARD::QAR1(H),XR(c)
    • S(g);N_GUARD,P_PINQ(H),SBLOCK::R(F)
  • Tries
    • Try
      • R(F);CHECK
      • Vars
        • R(c);OGATE,XR(F)::QAR1(H),XR(c)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(H);CHECK
      • Vars
        • B(f);N_GUARD,P_SPINB(f)::QAR1(H),XB(f)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • B(E);
    • Threat
      • QAR1(H)
    • Vars
      • R(c);OGATE,XB(E)::QAR1(H),XR(c)
      • S(a);OGATE,XP(B)::QAB(H),XS(a)
      • B(f);SBLOCK::S(D)
      • B(f);N_GUARD::QAR2(H)
      • S(a);N_GUARD::QAB(H)
      • S(a);N_GUARD::QAB(H),XS(a)
      • S(g);N_GUARD,P_PINQ(H),SBLOCK::R(F)
      • S(g);OGATE,P_PINQ(H)::QAB(H),XR(h)
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