MESON Chess Problem Database

Problem Display
PID: 100868 (1b6/3p1K2/1PpkPQ2/1br5/2pP1P2/4P3/8/8 w - - 0 1)

Cauveren, Jonas Ephraim

Good Companions, 1921

1b6/3p1K2/1PpkPQ2/1br5/2pP1P2/4P3/8/8

#2

7 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rd5
      • 2.Qe7#
      • 2.e7#
    • 1...Re5
      • 2.Qxe5#
    • 1...dxe6
      • 2.Qd8#
      • 2.Qxe6#
  • Tries
    • 1.e4?
      • threat
        • 2.Qe7#
        • 2.e7#
      • 1...dxe6
        • 2.Qe7#
        • 2.Qd8#
        • 2.Qxe6#
      • 1...Re5
        • 2.Qxe5#
        • 2.Qe7#
        • 2.fxe5#
      • 1...Rf5!
    • 1.dxc5+?
      • 1...Kd5
        • 2.Qd4#
      • 1...Kxc5!
    • 1.exd7+?
      • 1...Kd5
        • 2.Qe6#
      • 1...Kxd7!
  • Keys
    • 1.d5!
      • threat
        • 2.Qe5#
      • 1...Kxd5
        • 2.Qd4#
      • 1...Rxd5
        • 2.Qe7#
      • 1...cxd5
        • 2.e7#
      • 1...dxe6
        • 2.Qd8#
        • 2.Qxe6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • R(c);N_GUARD::QAB1(F),XR(c)
  • Tries
    • Try
      • P(A);
      • Threat
        • DUALS(2)
      • Refutation
        • R(c);P_PINQ(F)
    • Try
      • P(B);CHECK,XR(c)
      • Vars
        • K(e);P-FLIGHT::QAR1(F)
      • Refutation
        • K(e);S_FLIGHT,XP(B)
    • Try
      • P(E);CHECK,XP(f)
      • Vars
        • K(e);P-FLIGHT::QAB1(F)
      • Refutation
        • K(e);P-FLIGHT,XP(E)
  • Actual
    • P(B);
    • Threat
      • QAB1(F)
    • Vars
      • K(e);OGATEB,P-FLIGHT,XP(B)::QAR1(F)
      • R(c);SBLOCK,XP(B)::QAB1(F)
      • P(d);SBLOCK,XP(B)::QAR(F)+P(E)
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