MESON Chess Problem Database

Problem Display
PID: 68015 (b5K1/5Q2/r2p1Pp1/pN6/2n1k3/n4R2/qpP2R1B/4b3 w - - 0 1)

Alexander, Frederick Forrest Lawrie

Chess, 1949

b5K1/5Q2/r2p1Pp1/pN6/2n1k3/n4R2/qpP2R1B/4b3

#2

8 + 11

15148 Sadier Collection 2014

SOLUTION

  • SOUND
  • Sets
    • 1...d5
      • 2.Qxg6#
  • Tries
    • 1.Re2+?
      • 1...Se3
        • 2.Rexe3#
      • 1...Kxf3!
    • 1.Rf4+?
      • 1...Ke5
        • 2.Rxc4#
        • 2.Rd4#
        • 2.Rg4#
        • 2.Rh4#
      • 1...Ke3!
  • Keys
    • 1.Rd3!
      • threat
        • 2.Qxg6#
      • 1...Bd5
        • 2.Qxd5#
      • 1...Sd2
        • 2.Sc3#
      • 1...Se3
        • 2.Rd4#
      • 1...Se5
        • 2.Rf4#
      • 1...Sb6
        • 2.Sxd6#
      • 1...g5
        • 2.Qg6#
        • 2.Qh7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • P(i);SBLOCK::QAB(G),XP(j)
  • Tries
    • Try
      • R(B);CHECK
      • Vars
        • S(e);N_GUARD,P_PINQ(G),P_SPINS(e)::R1(B),XS(e)
      • Refutation
        • K(f);S_FLIGHT,XR(D)
    • Try
      • R(D);CHECK
      • Refutation
        • K(f);P-FLIGHT
  • Actual
    • R(D);
    • Threat
      • QAB(G),XP(j)
    • Vars
      • B(k);N_GUARD,P_PINQ(G)::QAB1(G),XB(k)
      • S(e);P_PINQ(G),S_CUTB(a)::S(E)
      • S(e);P_PINQ(G),SBLOCK::R1(D)
      • S(e);P_PINQ(G),SBLOCK::R1(B)
      • S(e);N_GUARD,P_PINQ(G),S_CUTR(h)::S(E),XP(i)
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