MESON Chess Problem Database

Problem Display
PID: 148051 (4RQ2/8/1p6/6pK/2Pp1b2/1Nq2kBR/3rpPbn/4n3 w - - 0 1)

Siers, Theodor

Die Schwalbe, 1933

4RQ2/8/1p6/6pK/2Pp1b2/1Nq2kBR/3rpPbn/4n3

#2

8 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Qa1
      • 2.Sxd2#
    • 1...Qxc4
      • 2.Sxd2#
    • 1...d3
      • 2.Re3#
    • 1...g4
      • 2.Qxf4#
  • Tries
    • 1.Bxf4+?
      • 1...Kxf2
        • 2.Be3#
      • 1...Bxh3!
  • Keys
    • 1.Qa3!
      • threat
        • 2.Qa8#
      • 1...Qxc4
        • 2.Sxd2#
        • 2.Sxd4#
      • 1...Bxg3
        • 2.Qf8#
      • 1...Qa5
        • 2.Sxd2#
        • 2.Sxd4#
      • 1...Qa1
        • 2.Sxd2#
        • 2.Sxd4#
      • 1...Qc2
        • 2.Sxd2#
        • 2.Sxd4#
      • 1...Qd3
        • 2.Sxd4#
      • 1...Qe3
        • 2.Sxd2#
      • 1...Ra2
        • 2.Sxd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 4
  • Sets
    • Q(f);N_GUARD::S(B),XR(b)
    • Q(f);N_GUARD,XP(E)::S(B),XR(b)
    • P(h);N_GUARD,S_CUTQ(f)::R1(G)
    • P(j);N_GUARD::QAR1(H),XB(i)
  • Tries
    • Try
      • B(C);CHECK,XB(i)
      • Vars
        • K(g);P-FLIGHT,XP(A)::QAR(H)+B(C),DCHECK
      • Refutation
        • B(d);XR(D)
  • Actual
    • Q(H);N_PINB(i)
    • Threat
      • QAB(H)
    • Vars
      • B(i);OGATEB,P_SPINB(i),XB(C)::QAR(H)
      • Q(f);S_CUTR(b)::S(B),XP(h)
      • Q(f);S_CUTB(i)::S(B),XR(b)
      • R(b);N_GUARD::S(B),XP(h)
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