MESON Chess Problem Database

Problem Display
PID: 121455 (8/2p5/2R2Qp1/p2kp3/2p5/5bK1/2N3n1/3r4 w - - 0 1)

Osvald, Karel

Bohemia, 1900

8/2p5/2R2Qp1/p2kp3/2p5/5bK1/2N3n1/3r4

#2

4 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Ke4
      • 2.Qxf3#
    • 1...Be4
      • 2.Qe6#
    • 1...e4
      • 2.Qe6#
  • Tries
    • 1.Rc5+?
      • 1...Ke4
        • 2.Qxf3#
        • 2.Qxg6#
      • 1...Kxc5!
    • 1.Rxc7?
      • threat
        • 2.Qc6#
      • 1...Ke4
        • 2.Qxf3#
      • 1...e4!
    • 1.Qf7+?
      • 1...Ke4
        • 2.Qxf3#
      • 1...Kxc6!
  • Keys
    • 1.Ra6!
      • threat
        • 2.Qc6#
      • 1...Ke4
        • 2.Qxf3#
      • 1...Kc5
        • 2.Rxa5#
      • 1...e4
        • 2.Qg5#
      • 1...c6
        • 2.Qxc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • K(f);S_FLIGHT::QAB1(D),XB(c)
    • B(c);SBLOCK::QAB1(D)
    • P(g);::QAB1(D)
  • Tries
    • Try
      • R(C);CHECK
      • Refutation
        • K(f);P-FLIGHT,XR(C)
    • Try
      • R(C);XP(i)
      • Threat
        • QAB1(D)
      • Vars
        • K(f);S_FLIGHT::QAB1(D),XB(c)
      • Refutation
        • P(g);
    • Try
      • Q(D);CHECK
      • Vars
        • K(f);S_FLIGHT::QAB1(D),XB(c)
      • Refutation
        • K(f);S_FLIGHT,XR(C)
  • Actual
    • R(C);
    • Threat
      • QAB1(D)
    • Vars
      • K(f);S_FLIGHT::QAB1(D),XB(c)
      • K(f);P-FLIGHT::R(C),XP(e)
      • P(g);OGATEB,SBLOCK::QAR(D)
      • P(i);::QAB1(D),XP(i)
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