MESON Chess Problem Database

Problem Display
PID: 268282 (7B/1p4N1/pQPqB3/6pK/2PN3p/P1knRn2/1pp2R2/1b6 w - - 0 1)

Gockel, Hubert

Probleemblad, 1986

7B/1p4N1/pQPqB3/6pK/2PN3p/P1knRn2/1pp2R2/1b6

#2

11 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd4
      • 2.Qb4#
    • 1...Ba2
      • 2.Rxc2#
    • 1...Sd2
      • 2.Se2#
    • 1...c1S
      • 2.Qxb2#
    • 1...c1R
      • 2.Qxb2#
  • Tries
    • 1.Sgf5?
      • threat
        • 2.Qb3#
      • 1...Qxa3
        • 2.Sxf3#
      • 1...Qxd4
        • 2.Qb4#
      • 1...c1S
        • 2.Qxb2#
      • 1...Qb4
        • 2.Qxb4#
      • 1...Ba2
        • 2.Rxc2#
      • 1...Sd2
        • 2.Se2#
      • 1...Sxd4!
    • 1.Qa5+?
      • 1...Kxd4
        • 2.Sf5#
      • 1...Qb4!
    • 1.Qb4+?
      • 1...Kxd4
        • 2.Sf5#
      • 1...Qxb4!
  • Keys
    • 1.c5!
      • threat
        • 2.Qb4#
      • 1...Kxd4
        • 2.Sf5#
      • 1...Qxc5
        • 2.Qxc5#
      • 1...Qxd4
        • 2.Qb3#
      • 1...a5
        • 2.Sb5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 4
  • Sets
    • Q(j);N_GUARD,SBLOCK,XS(E)::QAB1(G)
    • B(a);N_GUARD::R1(A),XP(c)
    • S(f);SBLOCK::S(E)
    • P(c);::QAB1(G),XP(b)
  • Tries
    • Try
      • S(J);
      • Threat
        • QAR1(G)
      • Vars
        • Q(j);N_GUARD,XP(B)::B(K)+S(E),XS(f)
        • Q(j);N_GUARD,P_SPINQ(j),XS(E)::QAB1(G)
        • P(c);::QAB1(G),XP(b)
        • Q(j);N_GUARD::QAB1(G),XQ(j)
        • B(a);N_GUARD::R1(A),XP(c)
        • S(f);SBLOCK::B(K)+S(E),DCHECK
      • Refutation
        • S(f);XS(E)
    • Try
      • Q(G);CHECK
      • Vars
        • K(d);N_SPINS(e),S_FLIGHT,XS(E)::B(K)+S(J),DCHECK
      • Refutation
        • Q(j);P_SPINQ(j)
    • Try
      • Q(G);CHECK
      • Vars
        • K(d);N_SPINS(e),S_FLIGHT,XS(E)::B(K)+S(J),DCHECK
      • Refutation
        • Q(j);XQ(G)
  • Actual
    • P(D);
    • Threat
      • QAB1(G)
    • Vars
      • K(d);N_SPINS(e),S_FLIGHT,XS(E)::B(K)+S(J),DCHECK
      • Q(j);OGATE,XP(D)::QAR2(G),XQ(j)
      • Q(j);SBLOCK,XS(E)::QAR1(G)
      • P(i);N_GUARD::S(E)
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