MESON Chess Problem Database

Problem Display
PID: 232230 (2R5/2q2B2/3p3b/1PP3r1/R1NkN1n1/K1p2PQ1/1nP4p/B7 w - - 0 1)

Liechtenhan, Walter

Schweizerische Schachzeitung, 1987

2R5/2q2B2/3p3b/1PP3r1/R1NkN1n1/K1p2PQ1/1nP4p/B7

#2

12 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Sd3
      • 2.Bxc3#
    • 1...Sf2
      • 2.Qxf2#
    • 1...Se5
      • 2.Qf2#
    • 1...Sf6
      • 2.Qf2#
  • Tries
    • 1.Qf2+?
      • 1...Se3
        • 2.Qxe3#
      • 1...Sxf2!
    • 1.Qxd6+?
      • 1...Rd5
        • 2.Qxd5#
      • 1...Qxd6!
  • Keys
    • 1.Qf4!
      • threat
        • 2.Sxb2#
      • 1...Qxc5+
        • 2.Sxc5#
      • 1...Sxc4+
        • 2.Rxc4#
      • 1...Qxf7
        • 2.Sf6#
      • 1...Rxc5
        • 2.Sg5#
      • 1...Sxa4
        • 2.Qd2#
      • 1...dxc5
        • 2.Sed6#
      • 1...Qa5
        • 2.Sed2#
        • 2.Sf2#
        • 2.Sg3#
        • 2.Sxg5#
        • 2.Sexd6#
        • 2.Sf6#
      • 1...Qa7
        • 2.Sed2#
        • 2.Sf2#
        • 2.Sg3#
        • 2.Sxg5#
        • 2.Sexd6#
        • 2.Sf6#
      • 1...Sd1
        • 2.Sb2#
        • 2.Scd2#
        • 2.Se3#
        • 2.Sa5#
        • 2.Se5#
        • 2.Sb6#
        • 2.Scxd6#
        • 2.Qd2#
      • 1...Sd3
        • 2.Bxc3#
      • 1...Se3
        • 2.Qxe3#
      • 1...Se5
        • 2.Qe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 7
    • REMOVED MATES = 2
  • Sets
    • S(a);OGATE,P_SPINP(c)::B(A),XP(c)
    • S(e);N_GUARD::QAB(E),XS(e)
    • S(e);N_GUARD::QAB(E)
  • Tries
    • Try
      • Q(E);CHECK
      • Vars
        • S(e);N_GUARD,P_SPINS(e)::QAB1(E),XS(e)
      • Refutation
        • S(e);XQ(E)
    • Try
      • Q(E);CHECK,XP(g)
      • Vars
        • R(f);N_GUARD,P_SPINR(f)::QAR1(E),XR(f)
      • Refutation
        • Q(i);P_PINP(J),XQ(E)
  • Actual
    • Q(E);
    • Threat
      • R(F)+S(G),XS(a)
    • Vars
      • Q(i);CHECK,XP(J)::QAR(E)+S(H),XQ(i)
      • S(a);CHECK,OGATE,P_SPINP(c),P_SPINS(a),XS(G)::R1(F),XS(a)
      • Q(i);XB(K)::QAR(E)+S(H)
      • R(f);SBLOCK,XP(J)::QAR(E)+S(H)
      • S(a);N_GUARD,P_SPINP(c),XR(F)::QAR2(E)
      • P(g);SBLOCK,XP(J)::QAR(E)+S(H)
      • S(a);OGATE,P_SPINP(c)::B(A),XP(c)
      • S(e);N_GUARD::QAB1(E),XS(e)
      • S(e);N_GUARD::QAB1(E)
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