MESON Chess Problem Database

Problem Display
PID: 210414 (3N2Rn/K3BpRB/4pp1k/3p4/2pp2P1/1p6/4p1qn/3b2Q1 w - - 0 1)

Prochazka, Hubert

The Observer, 1920

(First published on Sun Nov 28 1920)

3N2Rn/K3BpRB/4pp1k/3p4/2pp2P1/1p6/4p1qn/3b2Q1

#2

8 + 13

3360 Simple Two-move Themes 1924
20 De Problemist 1930
15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qe4
      • 2.Qxh2#
    • 1...Bc2
      • 2.Qc1#
    • 1...Sg6
      • 2.Sxf7#
    • 1...d3
      • 2.Qe3#
    • 1...f5
      • 2.Bg5#
  • Tries
    • 1.Bc2?
      • threat
        • 2.Rh7#
      • 1...Bxc2
        • 2.Qc1#
      • 1...Sg6
        • 2.Sxf7#
      • 1...Qe4
        • 2.Qxh2#
      • 1...d3
        • 2.Qe3#
      • 1...f5
        • 2.Bg5#
      • 1...bxc2!
    • 1.Bd3?
      • threat
        • 2.Rh7#
      • 1...Sg6
        • 2.Sxf7#
      • 1...Qe4
        • 2.Qxh2#
      • 1...f5
        • 2.Bg5#
      • 1...cxd3!
    • 1.Be4?
      • threat
        • 2.Rh7#
      • 1...Qxe4
        • 2.Qxh2#
      • 1...Sg6
        • 2.Sxf7#
      • 1...f5
        • 2.Bg5#
      • 1...dxe4!
    • 1.Bf5?
      • threat
        • 2.Rh7#
      • 1...Sg6
        • 2.Sxf7#
      • 1...exf5!
    • 1.Qxh2+?
      • 1...Qh3
        • 2.Qf4#
        • 2.Qxh3#
      • 1...Qxh2!
  • Keys
    • 1.Bb1!
      • threat
        • 2.Rh7#
      • 1...Sg6
        • 2.Sxf7#
      • 1...Qe4
        • 2.Qxh2#
      • 1...Bc2
        • 2.Qc1#
      • 1...d3
        • 2.Qe3#
      • 1...f5
        • 2.Bg5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • Q(c);N_GUARD::QAR(A),XS(d)
    • B(a);OGATE::QAB(A)
    • S(m);N_GUARD::S(G),XP(l)
    • P(g);N_GUARD::QAB(A)
    • P(j);OGATE::B(D)
  • Tries
    • Try
      • B(F);
      • Threat
        • R1(E)
      • Vars
        • B(a);OGATE,XB(F)::QAB(A)
        • S(m);N_GUARD::S(G),XP(l)
        • Q(c);N_GUARD::QAR(A),XS(d)
        • P(g);N_GUARD::QAB(A)
        • P(j);OGATE::B(D)
      • Refutation
        • P(e);XB(F)
    • Try
      • B(F);
      • Threat
        • R1(E)
      • Vars
        • S(m);N_GUARD::S(G),XP(l)
        • Q(c);N_GUARD::QAR(A),XS(d)
        • P(j);OGATE::B(D)
      • Refutation
        • P(f);XB(F)
    • Try
      • B(F);
      • Threat
        • R1(E)
      • Vars
        • Q(c);N_GUARD,XB(F)::QAR(A),XS(d)
        • S(m);N_GUARD::S(G),XP(l)
        • P(j);OGATE::B(D)
      • Refutation
        • P(h);XB(F)
    • Try
      • B(F);
      • Threat
        • R1(E)
      • Vars
        • S(m);N_GUARD::S(G),XP(l)
      • Refutation
        • P(i);XB(F)
    • Try
      • Q(A);CHECK,XS(d)
      • Refutation
        • Q(c);XQ(A)
  • Actual
    • B(F);
    • Threat
      • R1(E)
    • Vars
      • S(m);N_GUARD::S(G),XP(l)
      • Q(c);N_GUARD::QAR(A),XS(d)
      • B(a);OGATE::QAB(A)
      • P(g);N_GUARD::QAB(A)
      • P(j);OGATE::B(D)
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