MESON Chess Problem Database

Problem Display
PID: 1137 (Kb6/pQ3B2/4r3/2pP1N2/Pnk1bR2/2n1RN2/2Pp3q/8 w - - 0 1)

McWilliam, Robert C

Problem Observer, 1980

Kb6/pQ3B2/4r3/2pP1N2/Pnk1bR2/2n1RN2/2Pp3q/8

#2

10 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Qg1
      • 2.Sxd2#
    • 1...Qg3
      • 2.Sxd2#
    • 1...Qxf4
      • 2.Sxd2#
    • 1...Qh1
      • 2.Sxd2#
    • 1...Qh3
      • 2.Sxd2#
    • 1...Qh4
      • 2.Sxd2#
    • 1...Qh5
      • 2.Sxd2#
    • 1...Qh6
      • 2.Sxd2#
    • 1...Qh7
      • 2.Sxd2#
    • 1...Qh8
      • 2.Sxd2#
    • 1...Rd6
      • 2.Se5#
    • 1...Se2
      • 2.Sxd2#
    • 1...Scxd5
      • 2.Qb5#
    • 1...Sa2
      • 2.Qb3#
    • 1...Sd3
      • 2.Qb3#
      • 2.cxd3#
    • 1...Sbxd5
      • 2.Qb3#
    • 1...Sa6
      • 2.Qb3#
    • 1...Sc6
      • 2.Qb3#
  • Tries
    • 1.Rexe4+?
      • 1...Rxe4
        • 2.Se3#
      • 1...Sxe4!
  • Keys
    • 1.d6!
      • threat
        • 2.Se5#
      • 1...Qxf4
        • 2.Sxd2#
      • 1...Bxd6
        • 2.Sxd6#
      • 1...Sc6
        • 2.Qb3#
      • 1...Qh8
        • 2.Sxd2#
      • 1...Scd5
        • 2.Qb5#
      • 1...Sd3
        • 2.cxd3#
      • 1...Sbd5
        • 2.Qb3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 12
  • Sets
    • Q(b);N_GUARD::S(C),XP(a)
    • Q(b);N_GUARD,N_SPINB(f),XR(E)::S(C),XP(a)
    • R(h);N_GUARD,S_CUTB(j)::S(C)
    • S(c);S_CUTQ(b)::S(C),XP(a)
    • S(c);N_GUARD,SBLOCK,XP(F)::QAB1(H)
    • S(d);OGATE::QAB1(H)
    • S(d);OGATE,SBLOCK,XP(F)::QAB1(H)
  • Tries
    • Try
      • R(B);CHECK,XB(f)
      • Vars
        • R(h);P_SPINR(h),XR(B)::S(G)
      • Refutation
        • S(c);P_SPINS(c),XR(B)
  • Actual
    • P(F);P_PINR(h),P_SPINQ(H)
    • Threat
      • S(C)
    • Vars
      • Q(b);N_GUARD,N_SPINB(f),XR(E)::S(C),XP(a)
      • B(j);XP(F)::S(G),XB(j)
      • S(d);N_PINQ(H)::QAB1(H)
      • Q(b);N_GUARD::S(C),XP(a)
      • S(c);N_PINQ(H),N_SPINR(h),SBLOCK::QAB1(H)
      • S(d);OGATE::P(A),XS(d)
      • S(d);N_PINQ(H),N_SPINR(h),SBLOCK::QAB1(H)
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