MESON Chess Problem Database

Problem Display
PID: 210541 (8/1B6/7B/Q2P1P2/1N1P1RP1/1p2k1NR/pPp2p1n/Kbnqrrb1 w - - 0 1)

Stimson, James Frank (Ua Tane)

The Observer, 1921

(First published on Sun Feb 6 1921)

8/1B6/7B/Q2P1P2/1N1P1RP1/1p2k1NR/pPp2p1n/Kbnqrrb1

#2

13 + 12

15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kd2
      • 2.Rxf2#
    • 1...Qe2
      • 2.Sxf1#
    • 1...Qf3
      • 2.Re4#
    • 1...Re2
      • 2.Sxf1#
    • 1...Se2
      • 2.Sxf1#
    • 1...Sf3
      • 2.Re4#
  • Tries
    • 1.Se2+?
      • 1...Kd2
        • 2.Rxf2#
        • 2.Re4#
      • 1...Kxe2
        • 2.Re4#
      • 1...Sf3!
  • Keys
    • 1.d6!
      • 1...Kd2
        • 2.Rxf2#
      • 1...Qxg4
        • 2.Rxg4#
      • 1...Qxd4
        • 2.Rf3#
      • 1...Sxg4
        • 2.Rxg4#
      • 1...Sf3
        • 2.Re4#
      • 1...Qe2
        • 2.Sxf1#
      • 1...Qf3
        • 2.Re4#
      • 1...Qd2
        • 2.Qe5#
      • 1...Qd3
        • 2.Sd5#
      • 1...Re2
        • 2.Sxf1#
      • 1...Se2
        • 2.Sxf1#
      • 1...Sd3
        • 2.Sd5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • K(l);S_FLIGHT::B(L)+R(G),DCHECK,XP(i)
    • Q(c);SBLOCK::R(D)+S(C),DCHECK,XR(e)
    • Q(c);SBLOCK::B(L)+R(G),DCHECK
    • R(d);SBLOCK::R(D)+S(C),DCHECK,XR(e)
    • S(b);SBLOCK::R(D)+S(C),DCHECK,XR(e)
    • S(j);SBLOCK::B(L)+R(G),DCHECK
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • K(l);P-FLIGHT,XS(C)::R(G)
      • Refutation
        • S(j);P_SPINS(j)
  • Actual
    • P(J);
    • Vars
      • K(l);S_FLIGHT::B(L)+R(G),DCHECK,XP(i)
      • Q(c);OGATE,XP(H)::B(L)+R(G),XQ(c)
      • Q(c);P_PINP(B),SBLOCK,XP(F)::B(L)+R(G),DCHECK
      • S(j);OGATE,XP(H)::B(L)+R(G),XS(j)
      • S(j);SBLOCK::B(L)+R(G),DCHECK
      • Q(c);SBLOCK::R(D)+S(C),DCHECK,XR(e)
      • Q(c);SBLOCK::B(L)+R(G),DCHECK
      • Q(c);SBLOCK::QAR2(I)
      • Q(c);SBLOCK::S(E)
      • R(d);SBLOCK::R(D)+S(C),DCHECK,XR(e)
      • S(b);SBLOCK::R(D)+S(C),DCHECK,XR(e)
      • S(b);SBLOCK::S(E)
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