MESON Chess Problem Database

Problem Display
PID: 6792 (1B6/5p2/Q1R4b/3p1k2/2p1Np2/2P2R1P/6K1/8 w - - 0 1)

Alexander, Frederick Forrest Lawrie

Social Chess Quarterly (The), 1933

1B6/5p2/Q1R4b/3p1k2/2p1Np2/2P2R1P/6K1/8

#2

8 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Bg5
      • 2.Sg3#
    • 1...Bg7
      • 2.Rxf4#
    • 1...Bf8
      • 2.Rxf4#
    • 1...dxe4
      • 2.Rc5#
      • 2.Qb5#
      • 2.Qa5#
  • Tries
    • 1.Rxh6?
      • threat
        • 2.Rxf4#
      • 1...dxe4
        • 2.Rh5#
        • 2.Qb5#
        • 2.Qa5#
        • 2.Qf6#
      • 1...Kxe4!
    • 1.Qxc4?
      • threat
        • 2.Rf6#
        • 2.Qxd5#
      • 1...dxe4
        • 2.Qb5#
        • 2.Qd5#
        • 2.Qc5#
      • 1...d4
        • 2.Qd5#
      • 1...f6
        • 2.Rxf6#
      • 1...Bg5
        • 2.Sg3#
        • 2.Qxd5#
      • 1...Bg7
        • 2.Rxf4#
      • 1...dxc4!
    • 1.Qb5?
      • threat
        • 2.Qxd5#
      • 1...Kxe4
        • 2.Qb1#
      • 1...Bg7
        • 2.Rxf4#
      • 1...f6!
  • Keys
    • 1.Qb7!
      • 1...Kxe4
        • 2.Qb1#
      • 1...dxe4
        • 2.Qb5#
      • 1...f6
        • 2.Qh7#
      • 1...Bg5
        • 2.Sg3#
      • 1...Bg7
        • 2.Rxf4#
      • 1...Bf8
        • 2.Rxf4#
      • 1...d4
        • 2.Rf6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • B(e);SBLOCK::S(E)
    • B(e);N_GUARD::R1(C),XP(b)
  • Tries
    • Try
      • R(G);XB(e)
      • Threat
        • R1(C),XP(b)
      • Refutation
        • K(d);N_SPINP(b),S_FLIGHT,XS(E)
    • Try
      • Q(F);XP(a)
      • Threat
        • DUALS(2)
      • Vars
        • P(c);::QAR2(F)
        • P(f);::R1(G),XP(f)
        • B(e);N_GUARD::R1(C),XP(b)
      • Refutation
        • P(c);XQ(F)
    • Try
      • Q(F);
      • Threat
        • QAR2(F),XP(c)
      • Vars
        • K(d);N_SPINP(b),OGATEB,S_FLIGHT,XS(E)::QAB(F)
        • B(e);N_GUARD::R1(C),XP(b)
      • Refutation
        • P(f);
  • Actual
    • Q(F);
    • Vars
      • K(d);N_SPINP(b),OGATEB,S_FLIGHT,XS(E)::QAB(F)
      • P(c);OGATEB,SBLOCK,XS(E)::QAR(F)
      • P(f);OGATE::QAB(F)
      • B(e);SBLOCK::S(E)
      • B(e);N_GUARD::R1(C),XP(b)
      • P(c);::R1(G)
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