MESON Chess Problem Database

Problem Display
PID: 51716 (Q4q1B/5r1p/N7/7r/1p3p2/1PR4p/2KP4/kN5R w - - 0 1)

Lipton, Michael

Rice, John Michael

The Problemist, 2004

(First published on Mon Mar 1 2004)

Q4q1B/5r1p/N7/7r/1p3p2/1PR4p/2KP4/kN5R

#2

9 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Ka2
      • 2.Sxb4#
    • 1...bxc3
      • 2.Sxc3#
  • Tries
    • 1.Sxb4+?
      • 1...Ra5
        • 2.Sa3#
        • 2.Qxa5#
      • 1...Ra7
        • 2.Sa3#
      • 1...Qxa8!
    • 1.Sc5+?
      • 1...Ra7
        • 2.Qxa7#
      • 1...Qxa8!
    • 1.Sc7+?
      • 1...Ra5
        • 2.Qxa5#
      • 1...Qxa8!
    • 1.Sb8+?
      • 1...Ra5
        • 2.Qxa5#
      • 1...Ra7!
    • 1.Rg3+?
      • 1...Ka2
        • 2.Sxb4#
      • 1...Qg7
        • 2.Sc3#
      • 1...Qxh8
        • 2.Sc3#
      • 1...Rf6
        • 2.Sc3#
      • 1...Rg7
        • 2.Sc3#
      • 1...Re5!
    • 1.Rc7+?
      • 1...Ka2
        • 2.Sxb4#
      • 1...Qg7
        • 2.Sc5#
      • 1...Qxh8
        • 2.Sc3#
      • 1...Re5
        • 2.Sb8#
      • 1...Rf6
        • 2.Sc3#
      • 1...Rg7!
    • 1.Rc8+?
      • 1...Ka2
        • 2.Sxb4#
      • 1...Qxh8
        • 2.Sc3#
      • 1...Re5
        • 2.Sc7#
      • 1...Rf6
        • 2.Sc3#
        • 2.Sc5#
      • 1...Rg7
        • 2.Sc5#
      • 1...Qg7!
  • Keys
    • 1.Rc5+!
      • 1...Ka2
        • 2.Sxb4#
      • 1...Qg7
        • 2.Sc7#
      • 1...Qxh8
        • 2.Sc3#
      • 1...Re5
        • 2.Ra5#
      • 1...Rf6
        • 2.Sc3#
        • 2.Sb8#
      • 1...Rg7
        • 2.Sb8#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • K(a);P-FLIGHT::QAR(H)+S(G),DCHECK,XP(c)
    • P(c);P_SPINP(c),XR(F)::R(B)+S(A),XP(c)
  • Tries
    • Try
      • S(G);CHECK,XP(c)
      • Vars
        • R(f);P_SPINR(f)::R(B)+S(A)
      • Refutation
        • Q(h);XQ(H)
    • Try
      • S(G);CHECK
      • Vars
        • R(f);N_GUARD,P_SPINR(f)::QAR(H),XR(f)
      • Refutation
        • Q(h);XQ(H)
    • Try
      • S(G);CHECK
      • Vars
        • R(e);N_GUARD,P_SPINR(e)::QAR(H),XR(e)
      • Refutation
        • Q(h);XQ(H)
    • Try
      • S(G);CHECK
      • Vars
        • R(e);N_GUARD,P_SPINR(e)::QAR(H),XR(e)
      • Refutation
        • R(f);P_SPINR(f)
    • Try
      • R(F);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR(H)+S(G),DCHECK,XP(c)
        • Q(h);P_SPINQ(h)::R(B)+S(A)
        • Q(h);XB(I)::R(B)+S(A)
        • R(f);P_SPINR(f)::R(B)+S(A)
      • Refutation
        • R(e);P_SPINR(e)
    • Try
      • R(F);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR(H)+S(G),DCHECK,XP(c)
        • Q(h);P_SPINQ(h)::QAR(H)+S(G)
        • Q(h);XB(I)::R(B)+S(A)
        • R(e);P_SPINR(e)::QAR(H)+S(G)
        • R(f);P_SPINR(f)::R(B)+S(A)
      • Refutation
        • R(f);P_SPINR(f)
    • Try
      • R(F);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR(H)+S(G),DCHECK,XP(c)
        • Q(h);XB(I)::R(B)+S(A)
        • R(e);P_SPINR(e)::QAR(H)+S(G)
        • R(f);P_SPINR(f)::QAR(H)+S(G)
      • Refutation
        • Q(h);P_SPINQ(h)
  • Actual
    • R(F);CHECK
    • Vars
      • K(a);P-FLIGHT::QAR(H)+S(G),DCHECK,XP(c)
      • Q(h);P_SPINQ(h)::QAR(H)+S(G)
      • Q(h);XB(I)::R(B)+S(A)
      • R(e);P_SPINR(e)::R(F)
      • R(f);P_SPINR(f)::QAR(H)+S(G)
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