MESON Chess Problem Database

Problem Display
PID: 10105 (8/rp1Rp1qb/8/pQ6/K2Pkp2/1N3r2/n2p4/3N1nBB w - - 0 1)

Chandler, Guy Wills

Chess Circle of Longwy, 1962

8/rp1Rp1qb/8/pQ6/K2Pkp2/1N3r2/n2p4/3N1nBB

#2

8 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd4+
      • 2.Rxd4#
    • 1...Qxg1
      • 2.Rxe7#
    • 1...Qg2
      • 2.Rxe7#
    • 1...Qg3
      • 2.Rxe7#
    • 1...Bf5
      • 2.Sc5#
    • 1...Sh2
      • 2.Sxd2#
    • 1...Se3
      • 2.Sf2#
      • 2.Sxd2#
    • 1...Sg3
      • 2.Sxd2#
    • 1...Sc1
      • 2.Sc3#
    • 1...Sc3+
      • 2.Sxc3#
    • 1...Sb4
      • 2.Sc3#
  • Tries
    • 1.Sxa5?
      • threat
        • 2.Qb1#
      • 1...Qxd4+
        • 2.Rxd4#
      • 1...Sc3+
        • 2.Sxc3#
      • 1...Qg2
        • 2.Rxe7#
      • 1...Se3
        • 2.Sf2#
      • 1...Sc1
        • 2.Sc3#
      • 1...Sb4
        • 2.Sc3#
      • 1...Rxa5+!
    • 1.Rxe7+?
      • 1...Qe5
        • 2.Rxe5#
      • 1...Qxe7!
    • 1.Qf5+?
      • 1...Bxf5
        • 2.Sc5#
      • 1...Kxf5!
  • Keys
    • 1.Sa1!
      • threat
        • 2.Qb1#
      • 1...Qxd4+
        • 2.Rxd4#
      • 1...Sc3+
        • 2.Sxc3#
      • 1...Qg2
        • 2.Rxe7#
      • 1...Se3
        • 2.Sf2#
      • 1...Sc1
        • 2.Sc3#
      • 1...Sb4
        • 2.Sc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 5
  • Sets
    • Q(k);CHECK,OGATE,XP(F)::R1(H),XQ(k)
    • Q(k);N_GUARD,XB(B)::R(H),XP(j)
    • Q(k);N_GUARD,N_SPINR(d)::R(H),XP(j)
    • Q(k);N_GUARD::R(H),XP(j)
    • B(l);SBLOCK::S(D)
    • S(a);N_GUARD::S(D),XP(c)
    • S(b);N_GUARD::S(A)
    • S(b);CHECK,N_GUARD::S(A),XS(b)
  • Tries
    • Try
      • S(D);P_SPINS(D),XP(g)
      • Threat
        • QAB(G)
      • Vars
        • Q(k);CHECK,OGATE,XP(F)::R1(H),XQ(k)
        • S(b);CHECK,N_GUARD::S(A),XS(b)
        • Q(k);N_GUARD,N_SPINR(d)::R(H),XP(j)
        • S(a);SBLOCK::S(A)
        • S(b);N_GUARD::S(A)
      • Refutation
        • R(h);CHECK,XS(D)
    • Try
      • R(H);CHECK,XP(j)
      • Vars
        • Q(k);N_GUARD,P_SPINQ(k)::R1(H),XQ(k)
      • Refutation
        • Q(k);XR(H)
    • Try
      • Q(G);CHECK
      • Vars
        • B(l);SBLOCK,XQ(G)::S(D)
      • Refutation
        • K(e);N_SPINR(d),S_FLIGHT,XQ(G)
  • Actual
    • S(D);
    • Threat
      • QAB(G)
    • Vars
      • Q(k);CHECK,OGATE,XP(F)::R1(H),XQ(k)
      • S(b);CHECK,N_GUARD::S(A),XS(b)
      • Q(k);N_GUARD,N_SPINR(d)::R(H),XP(j)
      • S(a);SBLOCK::S(A)
      • S(b);N_GUARD::S(A)
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