MESON Chess Problem Database

Problem Display
PID: 235246 (8/3Bb3/4P3/pNqkPR2/1PN5/Q1PPB2K/3n4/8 w - - 0 1)

Heyl, Peter

Schach, 2008

8/3Bb3/4P3/pNqkPR2/1PN5/Q1PPB2K/3n4/8

#2

12 + 5

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe3+
      • 2.Sxe3#
    • 1...Qxb4
      • 2.Sb6#
      • 2.Sc7#
    • 1...Qd4
      • 2.Sc7#
    • 1...Qb6
      • 2.Sxb6#
    • 1...Qd6
      • 2.exd6#
    • 1...Qc7
      • 2.Sxc7#
    • 1...Qc8
      • 2.Sb6#
    • 1...Bd6
      • 2.exd6#
    • 1...Bf6
      • 2.exf6#
  • Tries
    • 1.Bxc5?
      • threat
        • 2.Se3#
        • 2.Sb6#
        • 2.Sc7#
      • 1...Bxc5
        • 2.Sc7#
      • 1...Sxc4
        • 2.Sc7#
      • 1...Bg5
        • 2.Sb6#
        • 2.Sc7#
      • 1...Bd6
        • 2.Se3#
        • 2.Sb6#
        • 2.exd6#
      • 1...Bd8
        • 2.Se3#
      • 1...Sf1
        • 2.Sb6#
        • 2.Sc7#
      • 1...axb4!
    • 1.Qxa5?
      • threat
        • 2.Sc7#
      • 1...Qxe3+
        • 2.Sxe3#
      • 1...Qxb5
        • 2.Sb6#
      • 1...Qc7
        • 2.Sxc7#
      • 1...Bd6
        • 2.exd6#
      • 1...Bd8!
    • 1.bxc5?
      • threat
        • 2.Sb6#
        • 2.Sc7#
      • 1...Bxc5
        • 2.Sc7#
        • 2.Qxc5#
      • 1...Sxc4
        • 2.Sc7#
      • 1...Bd6
        • 2.Sb6#
        • 2.exd6#
      • 1...Bd8!
  • Keys
    • 1.Qa2!
      • threat
        • 2.Sb6#
      • 1...Qxe3+
        • 2.Sxe3#
      • 1...Qxc4
        • 2.Sc7#
      • 1...Sxc4
        • 2.Qg2#
      • 1...Qb6
        • 2.Sxd2#
        • 2.Sxb6#
      • 1...Sb3
        • 2.Qg2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 7
  • Sets
    • Q(c);CHECK,XB(D)::S(G),XQ(c)
    • Q(c);N_GUARD::S(H)
    • Q(c);N_GUARD::S(G),XQ(c)
    • Q(c);OGATE::R(J)+P(I),XQ(c)
    • Q(c);N_GUARD::S(H),XQ(c)
    • Q(c);N_GUARD::S(G)
    • B(e);OGATE::R(J)+P(I),XB(e)
  • Tries
    • Try
      • B(D);XQ(c)
      • Threat
        • DUALS(3)
      • Vars
        • B(e);XB(D)::S(H)
        • S(a);XS(G)::S(H)
        • B(e);::S(G)
      • Refutation
        • P(b);XP(F)
    • Try
      • Q(A);XP(b)
      • Threat
        • S(H)
      • Vars
        • Q(c);CHECK,XB(D)::S(G),XQ(c)
        • Q(c);N_GUARD,P_SPINQ(c),XS(H)::S(G)
        • Q(c);::QAR(A)+S(H),DCHECK,XQ(c)
        • B(e);OGATE::R(J)+P(I),XB(e)
      • Refutation
        • B(e);
    • Try
      • P(F);XQ(c)
      • Threat
        • DUALS(2)
      • Vars
        • S(a);XS(G)::S(H)
      • Refutation
        • B(e);
  • Actual
    • Q(A);
    • Threat
      • QAB(A)+S(G),DCHECK
    • Vars
      • Q(c);CHECK,XB(D)::QAB(A)+S(G),DCHECK,XQ(c)
      • Q(c);N_GUARD,P_SPINQ(c),XS(G)::S(H)
      • S(a);OGATE,P_SPINS(a),XS(G)::QAB(A)
      • S(a);OGATE::QAB(A)
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