MESON Chess Problem Database

Problem Display
PID: 10490 (8/n5Qr/K4P1r/p1RP4/1p1kN3/Nq1Pp1B1/1P2P3/3R3B w - - 0 1)

Gross, Erwin

Die Schwalbe, 1965

8/n5Qr/K4P1r/p1RP4/1p1kN3/Nq1Pp1B1/1P2P3/3R3B

#2

13 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Qa2
      • 2.Sc2#
    • 1...Qc2
      • 2.Sxc2#
    • 1...Qc4+
      • 2.dxc4#
    • 1...Qxd5
      • 2.Sc2#
    • 1...Qxd3+
      • 2.Rxd3#
    • 1...Rxf6+
      • 2.Qxf6#
    • 1...Sb5
      • 2.Sxb5#
    • 1...Sc6
      • 2.Sb5#
    • 1...Sc8
      • 2.Sb5#
  • Tries
    • 1.Rc4+?
      • 1...Qxc4+
        • 2.dxc4#
      • 1...Kxd5!
    • 1.Qg5?
      • threat
        • 2.Be5#
        • 2.Qe5#
      • 1...Qc4+
        • 2.Rxc4#
        • 2.dxc4#
      • 1...Qxd3+
        • 2.Rxd3#
        • 2.Rc4#
      • 1...Rxf6+
        • 2.Qxf6#
      • 1...Qxd5
        • 2.Sc2#
        • 2.Rxd5#
        • 2.Qxd5#
      • 1...Rh5
        • 2.Be5#
      • 1...Sc6
        • 2.Sb5#
      • 1...Re7!
    • 1.d6?
      • threat
        • 2.Be5#
      • 1...Qc4+
        • 2.dxc4#
      • 1...Qxd3+
        • 2.Rxd3#
      • 1...Qd5
        • 2.Sc2#
      • 1...Qe6
        • 2.Sc2#
      • 1...Sc6
        • 2.Sb5#
      • 1...Rh5!
  • Keys
    • 1.Sg5!
      • threat
        • 2.Se6#
      • 1...Qc4+
        • 2.Rxc4#
      • 1...Qxd3+
        • 2.Rc4#
      • 1...Kxc5
        • 2.Se6#
        • 2.d4#
      • 1...Qxd5
        • 2.Rxd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 0
    • REMOVED MATES = 6
  • Sets
    • Q(a);N_GUARD::S(E)
    • Q(a);N_GUARD::S(E),XQ(a)
    • Q(a);CHECK,OGATE::R(A)+P(F),XQ(a)
    • Q(a);N_GUARD,XP(J)::S(E)
    • Q(a);CHECK,OGATE,P_SPINQ(a),XP(F)::R1(A),XQ(a)
    • R(f);CHECK,OGATE,P_SPINR(f),XP(L)::QAB(M),XR(f)
    • S(g);N_GUARD::S(E),XS(g)
    • S(g);N_GUARD,N_PINP(L)::S(E)
    • S(g);N_GUARD::S(E)
  • Tries
    • Try
      • R(I);CHECK
      • Vars
        • Q(a);CHECK,OGATE,XR(I)::R(A)+P(F),XQ(a)
      • Refutation
        • K(d);P-FLIGHT,XP(J)
    • Try
      • Q(M);
      • Threat
        • DUALS(2)
      • Vars
        • R(f);CHECK,OGATE,XP(L)::QAB(M),XR(f)
        • R(f);N_PINP(L)::B(G)
        • S(g);N_GUARD,N_PINP(L)::S(E)
      • Refutation
        • R(h);
    • Try
      • P(J);N_SPINP(L)
      • Threat
        • B(G)
      • Vars
        • Q(a);CHECK,OGATE::R(A)+P(F),XQ(a)
        • Q(a);CHECK,OGATE,P_SPINQ(a),XP(F)::R1(A),XQ(a)
        • Q(a);N_GUARD::S(E)
        • Q(a);N_GUARD,P_PINP(J)::S(E)
        • S(g);N_GUARD::S(E)
      • Refutation
        • R(f);
  • Actual
    • S(H);
    • Threat
      • S(H)
    • Vars
      • Q(a);CHECK,N_GUARD::R1(I),XQ(a)
      • Q(a);CHECK,N_GUARD,P_SPINQ(a),XP(F)::R1(I)
      • Q(a);OGATE,XP(J)::R1(I),XQ(a)
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