MESON Chess Problem Database

Problem Display
PID: 287397 (4k2n/2pp4/1b6/3B4/2p4B/q2p4/3Q1RK1/Rn6 w - - 0 1)

Zickermann, Albert

Die Schwalbe, 1935

4k2n/2pp4/1b6/3B4/2p4B/q2p4/3Q1RK1/Rn6

#2

6 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qc1
      • 2.Ra8#
    • 1...Qb2
      • 2.Ra8#
    • 1...Qb4
      • 2.Ra8#
    • 1...Qc5
      • 2.Ra8#
    • 1...Qd6
      • 2.Ra8#
    • 1...Qf8
      • 2.Ra8#
    • 1...Qb3
      • 2.Ra8#
    • 1...Qc3
      • 2.Ra8#
    • 1...Qa8
      • 2.Rxa8#
    • 1...c5
      • 2.Qe1#
      • 2.Qe3#
    • 1...d6
      • 2.Bc6#
  • Tries
    • 1.Bf7+?
      • 1...Kf8
        • 2.Qh6#
      • 1...Sxf7!
    • 1.Rf8+?
      • 1...Qxf8
        • 2.Ra8#
      • 1...Kxf8!
    • 1.Qe1+?
      • 1...Qe7
        • 2.Ra8#
        • 2.Qxe7#
      • 1...Be3!
    • 1.Qe3+?
      • 1...Qe7
        • 2.Ra8#
        • 2.Qxe7#
      • 1...Bxe3!
  • Keys
    • 1.Qb4!
      • threat
        • 2.Rf8#
      • 1...Qxb4
        • 2.Ra8#
      • 1...Bxf2
        • 2.Qb8#
      • 1...d6
        • 2.Bc6#
      • 1...Qb2
        • 2.Ra8#
        • 2.Qe7#
        • 2.Qf8#
      • 1...Qa2
        • 2.Qe7#
        • 2.Qf8#
      • 1...Bc5
        • 2.Qb8#
      • 1...Sg6
        • 2.Bf7#
      • 1...Sf7
        • 2.Bxf7#
      • 1...c5
        • 2.Qe1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 8
  • Sets
    • Q(b);OGATE::R(A)
    • Q(b);OGATE,P_PINB(F)::R(A),XQ(b)
    • P(g);OGATEB::B(F)
  • Tries
    • Try
      • B(F);CHECK
      • Vars
        • K(h);P-FLIGHT,S_CUTS(i)::QAB(B)
      • Refutation
        • S(i);XB(F)
    • Try
      • R(C);CHECK
      • Vars
        • Q(b);OGATE,SBLOCK,XR(C)::R(A)
      • Refutation
        • K(h);P-FLIGHT,XR(C)
    • Try
      • Q(B);CHECK
      • Refutation
        • B(e);P_SPINB(e)
    • Try
      • Q(B);CHECK
      • Refutation
        • B(e);XQ(B)
  • Actual
    • Q(B);
    • Threat
      • R1(C)
    • Vars
      • Q(b);OGATE,XQ(B)::R(A)
      • B(e);OGATE,XR(C)::QAR(B)
      • P(g);OGATEB::B(F)
      • B(e);OGATE::QAR(B)
      • S(i);N_GUARD::B(F)
      • S(i);N_GUARD::B(F),XS(i)
      • P(f);S_CUTB(e),S_CUTQ(b)::QAB(B)
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