MESON Chess Problem Database

Problem Display
PID: 225209 (8/NBpp4/2P1P2R/4kP2/5pP1/B5P1/2N5/3K3Q w - - 0 1)

Ruonala, Lauri Armas

3rd Prize, Suomen Shakki, 1953

8/NBpp4/2P1P2R/4kP2/5pP1/B5P1/2N5/3K3Q

#2

12 + 4

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...dxc6
      • 2.Sxc6#
    • 1...dxe6
      • 2.Rxe6#
    • 1...d5
      • 2.Qe1#
    • 1...d6
      • 2.Bb2#
  • Tries
    • 1.Qg1?
      • threat
        • 2.Qd4#
      • 1...Kd5
        • 2.Qd4#
      • 1...Ke4!
  • Keys
    • 1.cxd7!
      • threat
        • 2.Sc6#
        • 2.Qe4#
        • 2.Qd5#
        • 2.Qe1#
      • 1...fxg3
        • 2.Qe4#
      • 1...c5
        • 2.Qd5#
      • 1...f3
        • 2.Qe1#
      • 1...c6
        • 2.Sxc6#

This is a version of 196523

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 4
  • Sets
    • P(d);XP(H)::S(K),XP(d)
    • P(d);OGATE,XP(I)::R1(J),XP(d)
    • P(d);SBLOCK::QAR(B)
    • P(d);SBLOCK::B(D)
  • Tries
    • Try
      • Q(B);
      • Threat
        • QAB1(B)
      • Vars
        • K(b);P-FLIGHT::QAR1(B)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • P(H);XP(d)
    • Threat
      • DUALS(4)
    • Vars
      • P(a);XP(E)::QAR1(B)
      • P(c);::QAR1(B)
      • P(a);::QAR(B)
      • P(c);::S(K),XP(c)
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