MESON Chess Problem Database

Problem Display
PID: 242863 (4QBb1/5ppq/7p/n1pk2p1/3PR3/4pR2/1N2K3/5B2 w - - 0 1)

Degener, Udo

Schach, 1979

4QBb1/5ppq/7p/n1pk2p1/3PR3/4pR2/1N2K3/5B2

#2

8 + 10

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe4
      • 2.Qd7#
    • 1...Qf5
      • 2.Rxf5#
    • 1...Qh8
      • 2.Rf5#
    • 1...Sb3
      • 2.Qa8#
    • 1...Sc4
      • 2.Qa8#
    • 1...cxd4
      • 2.Re5#
  • Tries
    • 1.Rff4?
      • threat
        • 2.Re5#
        • 2.Qd7#
      • 1...Qxe4
        • 2.Qd7#
        • 2.Qxe4#
      • 1...Qg6
        • 2.Re5#
      • 1...Qf5
        • 2.Rxf5#
      • 1...Sc4
        • 2.Qa8#
      • 1...Sc6
        • 2.Qd7#
      • 1...Sb7
        • 2.Re5#
      • 1...f6
        • 2.Qd7#
      • 1...gxf4!
    • 1.Rf6?
      • threat
        • 2.Rd6#
        • 2.Qe5#
      • 1...Qxe4
        • 2.Rd6#
        • 2.Qd7#
        • 2.Qd8#
      • 1...cxd4
        • 2.Re5#
        • 2.Qe5#
      • 1...Qg6
        • 2.Qe5#
      • 1...Qf5
        • 2.Rxf5#
        • 2.Rd6#
      • 1...Sc4
        • 2.Qc6#
        • 2.Qa8#
      • 1...Sc6
        • 2.Rd6#
        • 2.Qxc6#
      • 1...Sb7
        • 2.Qc6#
        • 2.Qe5#
      • 1...gxf6!
    • 1.Qa8+?
      • 1...Sb7
        • 2.Qxb7#
      • 1...Sc6!
  • Keys
    • 1.Kxe3!
      • threat
        • 2.Re5#
        • 2.Qd7#
      • 1...Qxe4+
        • 2.Qxe4#
      • 1...Sc4+
        • 2.Bxc4#
      • 1...cxd4+
        • 2.Rxd4#
      • 1...Qg6
        • 2.Re5#
      • 1...Qf5
        • 2.Rxf5#
      • 1...Sc6
        • 2.Bc4#
        • 2.Qd7#
      • 1...Sb7
        • 2.Bc4#
        • 2.Re5#
      • 1...f6
        • 2.Qd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • Q(i);SBLOCK,XR(F)::QAR2(G)
    • Q(i);N_GUARD::R(D),XQ(i)
    • Q(i);N_GUARD::R(D)
    • S(b);N_GUARD::QAB(G)
    • P(c);SBLOCK,XP(E)::R1(F)
  • Tries
    • Try
      • R(D);
      • Threat
        • DUALS(2)
      • Vars
        • Q(i);::R1(F)
        • Q(i);N_GUARD::R(D),XQ(i)
        • S(b);N_GUARD::QAB(G)
        • S(b);::QAR2(G)
        • S(b);::R1(F)
        • P(g);::QAR2(G)
      • Refutation
        • P(e);XR(D)
    • Try
      • R(D);
      • Threat
        • DUALS(2)
      • Vars
        • Q(i);::QAR1(G)
      • Refutation
        • P(h);XR(D)
    • Try
      • Q(G);CHECK
      • Vars
        • S(b);N_GUARD,P_SPINS(b)::QAB(G),XS(b)
      • Refutation
        • S(b);P_SPINS(b)
  • Actual
    • K(C);P-FLIGHT,XP(a)
    • Threat
      • DUALS(2)
    • Vars
      • Q(i);CHECK,OGATE,XR(F)::QAB1(G),XQ(i)
      • S(b);CHECK,N_GUARD::B(A),XS(b)
      • P(c);CHECK,OGATE,XP(E)::R1(F),XP(c)
      • Q(i);::R1(F)
      • Q(i);N_GUARD::R(D),XQ(i)
      • P(g);::QAR2(G)
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