MESON Chess Problem Database

Problem Display
PID: 179978 (K3B3/b4pr1/p4N2/n1kNPp2/R1Pp1p2/1pB3p1/1r2p3/7Q w - - 0 1)

Gross, Erwin

4th HM., Schach-Aktiv, 1988

K3B3/b4pr1/p4N2/n1kNPp2/R1Pp1p2/1pB3p1/1r2p3/7Q

#2

9 + 13

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Sxc4
      • 2.Bb4#
    • 1...Sc6
      • 2.Sd7#
    • 1...dxc3
      • 2.Qg1#
    • 1...d3
      • 2.Qg1#
  • Tries
    • 1.Se7?
      • threat
        • 2.Sd7#
      • 1...Sxc4
        • 2.Qc6#
      • 1...dxc3
        • 2.Qg1#
      • 1...Kb6!
    • 1.Qe4?
      • threat
        • 2.Bxd4#
        • 2.Qxd4#
      • 1...dxc3
        • 2.Rxa5#
      • 1...fxe4
        • 2.Sxe4#
      • 1...Sc6
        • 2.Sd7#
      • 1...d3
        • 2.Bb4#
        • 2.Bd4#
        • 2.Rxa5#
        • 2.Qd4#
      • 1...Rd2!
    • 1.Qg1?
      • threat
        • 2.Bxd4#
        • 2.Qxd4#
      • 1...Sc6
        • 2.Sd7#
      • 1...Rd2!
    • 1.Qh6?
      • threat
        • 2.Sd7#
      • 1...Sxc4
        • 2.Bb4#
      • 1...Rg6
        • 2.Qf8#
      • 1...dxc3!
  • Keys
    • 1.Qa1!
      • threat
        • 2.Qa3#
      • 1...Sxc4
        • 2.Bb4#
      • 1...dxc3
        • 2.Qg1#
      • 1...Ra2
        • 2.Bxd4#
      • 1...Sc6
        • 2.Sd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • S(g);SBLOCK,XP(D)::B(B)
    • S(g);SBLOCK::S(G)
    • P(e);OGATEB,XB(B)::QAB(A)
    • P(e);OGATEB::QAB(A)
  • Tries
    • Try
      • S(E);
      • Threat
        • S(G)
      • Vars
        • S(g);N_GUARD,XP(D)::QAR1(A)
        • P(e);OGATEB,XB(B)::QAB(A)
      • Refutation
        • K(h);S_FLIGHT
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • P(e);XB(B)::R(C),XS(g)
        • P(i);XQ(A)::S(G),XP(i)
        • S(g);SBLOCK::S(G)
      • Refutation
        • R(a);
    • Try
      • Q(A);P_PINP(e)
      • Threat
        • DUALS(2)
      • Vars
        • S(g);SBLOCK::S(G)
      • Refutation
        • R(a);
    • Try
      • Q(A);
      • Threat
        • S(G)
      • Vars
        • S(g);SBLOCK,XP(D)::B(B)
        • R(m);OGATE::QAB(A)
      • Refutation
        • P(e);XB(B)
  • Actual
    • Q(A);
    • Threat
      • QAB(A)
    • Vars
      • S(g);SBLOCK,XP(D)::B(B)
      • P(e);OGATEB,XB(B)::QAB(A)
      • R(a);::B(B),XP(e)
      • S(g);SBLOCK::S(G)
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