MESON Chess Problem Database

Problem Display
PID: 242868 (4N3/1p1r4/1K3Q2/R1pk1Pp1/1n1NpP2/1Pqr1n2/2P5/6b1 w - - 0 1)

Degener, Udo

Schach, 1982

4N3/1p1r4/1K3Q2/R1pk1Pp1/1n1NpP2/1Pqr1n2/2P5/6b1

#2

9 + 11

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qa1
      • 2.Rxc5#
      • 2.c4#
    • 1...Qe1
      • 2.Rxc5#
      • 2.c4#
    • 1...Qb2
      • 2.Rxc5#
      • 2.c4#
    • 1...Qd2
      • 2.Rxc5#
      • 2.c4#
    • 1...Qxd4
      • 2.Qe6#
    • 1...Qxb3
      • 2.Rxc5#
    • 1...Rxd4
      • 2.Qe6#
    • 1...Rd6+
      • 2.Qxd6#
    • 1...Rc7
      • 2.Sxc7#
      • 2.Qd6#
    • 1...Re7
      • 2.Qd6#
    • 1...Rf7
      • 2.Qd6#
    • 1...Rg7
      • 2.Qd6#
    • 1...Rh7
      • 2.Qd6#
    • 1...Rd8
      • 2.Sc7#
      • 2.Qxd8#
    • 1...Bxd4
      • 2.Qe6#
    • 1...Se1
      • 2.Qe5#
    • 1...Sd2
      • 2.Qe5#
    • 1...Sh2
      • 2.Qe5#
    • 1...Sxd4
      • 2.Qe5#
    • 1...Sh4
      • 2.Qe5#
    • 1...Se5
      • 2.Qxe5#
  • Tries
    • 1.Se2?
      • threat
        • 2.Qe6#
      • 1...Rd6+
        • 2.Qxd6#
      • 1...Qe5
        • 2.c4#
      • 1...Re7
        • 2.Qd6#
      • 1...Sd4
        • 2.Qe5#
      • 1...Qxf6+!
  • Keys
    • 1.Sb5!
      • threat
        • 2.Qe6#
      • 1...Qxf6+
        • 2.Sxf6#
      • 1...Rd6+
        • 2.Qxd6#
      • 1...c4+
        • 2.Sd4#
      • 1...Qe5
        • 2.c4#
      • 1...Re7
        • 2.Qd6#
      • 1...Sd4
        • 2.Qe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 12
  • Sets
    • Q(b);SBLOCK,XS(C)::QAB1(H)
    • Q(b);N_GUARD,XP(B)::R1(E),XP(g)
    • R(c);SBLOCK,XS(C)::QAB1(H)
    • R(k);CHECK,N_GUARD::QAR1(H),XR(k)
    • R(k);N_GUARD::QAR1(H)
    • B(a);SBLOCK,XS(C)::QAB1(H)
    • S(d);N_GUARD::QAR1(H)
    • S(d);N_GUARD,XS(C)::QAR1(H)
    • S(d);N_GUARD::QAR1(H),XS(d)
  • Tries
    • Try
      • S(C);
      • Threat
        • QAB1(H)
      • Vars
        • R(k);CHECK,N_GUARD::QAR1(H),XR(k)
        • Q(b);OGATE::P(A)
        • R(k);N_GUARD::QAR1(H)
        • S(d);N_GUARD,S_CUTQ(b)::QAR1(H)
      • Refutation
        • Q(b);CHECK,XQ(H)
  • Actual
    • S(C);N_PINP(g)
    • Threat
      • QAB1(H)
    • Vars
      • Q(b);CHECK,XQ(H)::S(I),XQ(b)
      • R(k);CHECK,N_GUARD::QAR1(H),XR(k)
      • P(g);CHECK::R(E)+S(C)
      • Q(b);OGATE::P(A)
      • R(k);N_GUARD::QAR1(H)
      • S(d);N_GUARD,S_CUTQ(b)::QAR1(H)
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