MESON Chess Problem Database

Problem Display
PID: 238640 (Nrb1BK2/q1p1pP1N/1p2k2n/1p4pp/1n2P2b/3p4/7B/2Q2R2 w - - 0 1)

van der Scheur, D

Probleemblad, 1981

Nrb1BK2/q1p1pP1N/1p2k2n/1p4pp/1n2P2b/3p4/7B/2Q2R2

#2

9 + 14

SOLUTION

  • SOUND
  • Sets
    • 1...Qa1
      • 2.Sxc7#
    • 1...Qa2
      • 2.Sxc7#
    • 1...Qa3
      • 2.Sxc7#
    • 1...Qa4
      • 2.Sxc7#
    • 1...Qa5
      • 2.Sxc7#
    • 1...Qa6
      • 2.Sxc7#
    • 1...Be1
      • 2.Sxg5#
    • 1...Bb7
      • 2.Sxc7#
    • 1...Sa2
      • 2.Qc6#
    • 1...Sd5
      • 2.Qc6#
    • 1...Sa6
      • 2.Qc6#
    • 1...Sc6
      • 2.Qxc6#
    • 1...Sg8
      • 2.fxg8Q#
      • 2.fxg8B#
  • Tries
    • 1.Qc4+?
      • 1...Sd5
        • 2.Qxd5#
        • 2.Qc6#
        • 2.exd5#
      • 1...bxc4!
    • 1.Qc5?
      • threat
        • 2.Qxe7#
        • 2.Qe5#
      • 1...Sxf7
        • 2.Qxe7#
        • 2.Qf5#
      • 1...Qa1
        • 2.Sxc7#
        • 2.Qxe7#
      • 1...Bg3
        • 2.Sxg5#
        • 2.Qxe7#
      • 1...Sd5
        • 2.Qxd5#
        • 2.Qc6#
        • 2.exd5#
      • 1...Sc6
        • 2.Qd5#
        • 2.Qxc6#
      • 1...Sg4
        • 2.Qxe7#
        • 2.Qf5#
      • 1...Sf5
        • 2.Qe5#
        • 2.Qxf5#
        • 2.exf5#
      • 1...Sg8
        • 2.Qe5#
        • 2.Qf5#
        • 2.fxg8Q#
        • 2.fxg8B#
      • 1...g4
        • 2.Qe5#
      • 1...c6
        • 2.Qe5#
      • 1...bxc5!
    • 1.Qxc7?
      • threat
        • 2.Qe5#
      • 1...Qxc7
        • 2.Sxc7#
      • 1...Sxf7
        • 2.Bxf7#
      • 1...Qa1
        • 2.Qxe7#
      • 1...Bg3
        • 2.Sxg5#
      • 1...Sc6
        • 2.Qxc6#
      • 1...Sg4!
  • Keys
    • 1.Qxg5!
      • threat
        • 2.Qe5#
      • 1...Bxg5
        • 2.Sxg5#
      • 1...Sxf7
        • 2.Qf5#
      • 1...Bg3
        • 2.Qxe7#
      • 1...Qa1
        • 2.Sxc7#
      • 1...Sc6
        • 2.Qd5#
      • 1...Sg4
        • 2.Qf5#
      • 1...Sf5
        • 2.Qxf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 10
  • Sets
    • Q(j);N_GUARD::S(G),XP(k)
    • B(c);N_GUARD::S(F),XP(e)
    • B(n);P_PINB(H),S_CUTQ(j)::S(G),XP(k)
    • S(b);N_GUARD::QAR2(A)
    • S(b);N_GUARD::QAR2(A),XS(b)
    • S(i);OGATE::PXS(i)=Q
  • Tries
    • Try
      • Q(A);CHECK
      • Refutation
        • P(d);XQ(A)
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • P(e);::QAR1(A)
        • P(k);::QAR1(A)
      • Refutation
        • P(g);XQ(A)
    • Try
      • Q(A);XP(k)
      • Threat
        • QAR1(A)
      • Vars
        • Q(j);XQ(A)::S(G),XQ(j)
        • S(i);OGATE,XP(E)::B(H),XS(i)
        • Q(j);N_GUARD::QAR1(A),XP(l)
        • B(c);N_GUARD::S(F),XP(e)
        • S(b);N_GUARD::QAR2(A),XS(b)
      • Refutation
        • S(i);
  • Actual
    • Q(A);XP(e)
    • Threat
      • QAR1(A)
    • Vars
      • B(c);XQ(A)::S(F),XB(c)
      • S(i);N_GUARD,XP(E)::QAB1(A)
      • B(c);N_GUARD::QAR1(A),XP(l)
      • Q(j);N_GUARD::S(G),XP(k)
      • S(b);N_GUARD::QAB1(A)
      • S(i);N_GUARD::QAB1(A)
      • S(i);N_GUARD::QAB1(A),XS(i)
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