MESON Chess Problem Database

Problem Display
PID: 283 (3Q3b/2pr4/5Pp1/2pP2K1/3k2NR/3pNPpp/BP1P4/6q1 w - - 0 1)

Guidelli, Giorgio

HM., The Observer, 1920

(First published on Sun Jun 20 1920)

3Q3b/2pr4/5Pp1/2pP2K1/3k2NR/3pNPpp/BP1P4/6q1

#2

11 + 10

887 Mate in Two Moves 1931
15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe3+
      • 2.dxe3#
    • 1...Rxd5+
      • 2.Qxd5#
    • 1...Bxf6+
      • 2.Qxf6#
  • Tries
    • 1.Qe7?
      • threat
        • 2.Sf2#
        • 2.Sh2#
        • 2.Se5#
        • 2.Sh6#
        • 2.Qe4#
        • 2.Qe5#
      • 1...Qxe3+
        • 2.Sxe3#
        • 2.Qxe3#
        • 2.dxe3#
      • 1...Rxd5+
        • 2.Se5#
      • 1...Bxf6+
        • 2.Sxf6#
        • 2.Qxf6#
      • 1...Qf2
        • 2.Sxf2#
        • 2.Sh2#
        • 2.Se5#
        • 2.Sh6#
        • 2.Qe4#
        • 2.Qe5#
      • 1...Qh2
        • 2.Sf2#
        • 2.Sxh2#
        • 2.Se5#
        • 2.Sh6#
        • 2.Qe4#
        • 2.Qe5#
      • 1...h2
        • 2.Sf2#
        • 2.Sxh2#
        • 2.Se5#
        • 2.Sh6#
        • 2.Qe4#
        • 2.Qe5#
      • 1...c4
        • 2.Sf2#
        • 2.Sh2#
        • 2.Se5#
        • 2.Sh6#
      • 1...Rxe7!
  • Keys
    • 1.Sc4!
      • threat
        • 2.Sge3#
      • 1...Qe3+
        • 2.Sgxe3#
      • 1...Rxd5+
        • 2.Sge5#
      • 1...Bxf6+
        • 2.Sxf6#
      • 1...Kxd5
        • 2.Qxd7#
      • 1...Re7
        • 2.Sge5#
      • 1...Rh7
        • 2.Sh6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • Q(a);CHECK,OGATE,XS(D)::P(C),XQ(a)
    • R(i);CHECK,OGATE,P_SPINR(i),XP(H)::QAR1(K),XR(i)
    • B(j);CHECK,OGATE,XP(J)::QAB(K),XB(j)
  • Tries
    • Try
      • Q(K);
      • Threat
        • DUALS(6)
      • Vars
        • R(i);CHECK,XP(H)::R(G)+S(F)
      • Refutation
        • R(i);XQ(K)
  • Actual
    • S(D);
    • Threat
      • R(G)+S(F)
    • Vars
      • Q(a);CHECK::R(G)+S(F),XQ(a)
      • R(i);CHECK,P_SPINR(i),XP(H)::R(G)+S(F)
      • B(j);CHECK,XP(J)::R(G)+S(F),XB(j)
      • K(e);OGATEB,P-FLIGHT,P_SPINR(i),XP(H)::QAR2(K),XR(i)
      • R(i);::R(G)+S(F)
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