MESON Chess Problem Database

Problem Display
PID: 153381 (8/8/8/2K1Q3/8/N2p2N1/1p1k1p2/1Rn1nR2 w - - 0 1)

Todd, William R

2nd HM., Good Companions (January Meredith Ty.), 1916

8/8/8/2K1Q3/8/N2p2N1/1p1k1p2/1Rn1nR2

#2

6 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Sa2
      • 2.Rxf2#
    • 1...Sc2
      • 2.Sc4#
    • 1...Sg2
      • 2.Rxb2#
    • 1...Sf3
      • 2.Rxb2#
  • Tries
    • 1.Rxb2+?
      • 1...Sc2
        • 2.Sb1#
        • 2.Sc4#
      • 1...Kd1!
    • 1.Rxf2+?
      • 1...Se2
        • 2.Sf1#
      • 1...Kd1!
    • 1.Qd4?
      • 1...Kd1
        • 2.Qxd3#
      • 1...Se2
        • 2.Se4#
      • 1...Sa2
        • 2.Rxf2#
      • 1...Sc2
        • 2.Sc4#
      • 1...Sg2
        • 2.Rxb2#
      • 1...Sf3
        • 2.Rxb2#
      • 1...Sb3+!
    • 1.Qf4+?
      • 1...Kc3
        • 2.Qb4#
      • 1...Kd1!
  • Keys
    • 1.Qxb2+!
      • 1...Kd1
        • 2.Rxc1#
        • 2.Qxc1#
      • 1...Ke3
        • 2.Qxf2#
      • 1...Sc2
        • 2.Sc4#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • S(a);N_GUARD::R(B),XP(e)
    • S(b);SBLOCK::S(C)
    • S(b);N_GUARD::R(A),XP(c)
  • Tries
    • Try
      • R(A);CHECK,XP(c)
      • Refutation
        • K(d);P-FLIGHT,P_SPINS(b)
    • Try
      • R(B);CHECK,XP(e)
      • Vars
        • S(a);P_SPINS(a)::S(D)
      • Refutation
        • K(d);P-FLIGHT,P_SPINS(a)
    • Try
      • Q(F);P_PINP(f)
      • Vars
        • K(d);P-FLIGHT,P_SPINS(a)::QAR2(F),XP(f)
        • S(a);SBLOCK::S(D)
        • S(a);N_GUARD::R(B),XP(e)
        • S(b);SBLOCK::S(C)
        • S(b);N_GUARD::R(A),XP(c)
      • Refutation
        • S(a);CHECK
    • Try
      • Q(F);CHECK
      • Vars
        • K(d);S_FLIGHT::QAB1(F)
      • Refutation
        • K(d);P-FLIGHT,P_SPINS(a)
  • Actual
    • Q(F);CHECK,XP(c)
    • Vars
      • K(d);OGATE,S_FLIGHT::QAB1(F),XP(e)
      • S(b);P_SPINS(b)::S(C)
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