MESON Chess Problem Database

Problem Display
PID: 212642 (7b/8/4K3/p7/P7/n3R3/NpRNp3/kb5Q w - - 0 1)

Niesslbeck, Karl

Schach-Echo, 1961

7b/8/4K3/p7/P7/n3R3/NpRNp3/kb5Q

#2

7 + 7

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sxc2
      • 2.Qxb1#
    • 1...Sc4
      • 2.Qxb1#
    • 1...Sb5
      • 2.Qxb1#
  • Tries
    • 1.Sb4?
      • threat
        • 2.Sb3#
        • 2.Rxa3#
      • 1...Sxc2
        • 2.Sb3#
        • 2.Qxb1#
      • 1...e1Q
        • 2.Sb3#
      • 1...e1S
        • 2.Sb3#
      • 1...e1B
        • 2.Sb3#
      • 1...e1R
        • 2.Sb3#
      • 1...Bc3
        • 2.Sb3#
      • 1...Sc4
        • 2.Sb3#
        • 2.Qxb1#
      • 1...Sb5
        • 2.Sb3#
        • 2.Qxb1#
      • 1...axb4!
  • Keys
    • 1.Sc1!
      • threat
        • 2.Sdb3#
      • 1...Ba2+
        • 2.Scb3#
      • 1...Bxc2
        • 2.Rxa3#
      • 1...bxc1S
        • 2.Qxh8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • S(e);N_GUARD,XR(C)::QAR1(A),XB(b)
    • S(e);N_GUARD::QAR1(A),XB(b)
  • Tries
    • Try
      • S(B);
      • Threat
        • DUALS(2)
      • Vars
        • P(d);N_SPINB(b),P_PINR(E)::S(D)
        • P(d);N_SPINB(b)::S(D)
        • B(g);::S(D)
      • Refutation
        • P(f);XS(B)
  • Actual
    • S(B);N_PINB(b)
    • Threat
      • S(D)
    • Vars
      • B(b);CHECK,SBLOCK::QAR(A)+S(B),DCHECK
      • B(b);N_GUARD,XR(C)::R(E),XS(e)
      • P(c);OGATEB,XS(B)::QAB(A),XB(g)
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