MESON Chess Problem Database

Problem Display
PID: 120241 (r3k3/p7/Q3K3/8/5B2/6b1/8/8 w q - 0 1)

Paalanen, Erkki

De Waarheid, 1969

(First published on Sat Aug 23 1969)

r3k3/p7/Q3K3/8/5B2/6b1/8/8

#2

3 + 4

6490 yacpdb 2009
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rc8
      • 2.Qxc8#
  • Tries
    • 1.Qb5+?
      • 1...Kd8
        • 2.Qd7#
      • 1...Kf8!
    • 1.Qb7?
      • threat
        • 2.Qxa8#
        • 2.Qe7#
      • 1...Kd8
        • 2.Qxa8#
        • 2.Qd7#
      • 1...Kf8
        • 2.Qf7#
      • 1...Bxf4
        • 2.Qe7#
      • 1...Rb8
        • 2.Qe7#
        • 2.Qxb8#
      • 1...Rc8
        • 2.Qxc8#
        • 2.Qe7#
      • 1...Rd8
        • 2.Qe7#
        • 2.Qf7#
      • 1...Bh4!
    • 1.Qa3?
      • threat
        • 2.Qe7#
      • 1...Kd8
        • 2.Qf8#
      • 1...0-0-0
        • 2.Qa6#
      • 1...Bh4!
    • 1.Qa4+?
      • 1...Kd8
        • 2.Qd7#
      • 1...Kf8!
    • 1.Qc6+?
      • 1...Kd8
        • 2.Bg5#
        • 2.Qd7#
        • 2.Qxa8#
      • 1...Kf8!
  • Keys
    • 1.Qa1!
      • threat
        • 2.Qh8#
      • 1...Kd8
        • 2.Qh8#
      • 1...Kf8
        • 2.Qh8#
      • 1...0-0-0
        • 2.Qa6#

Anticipated by 129823(1959)

This anticipates 205838(1977), 249875(1977)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • R(c);N_GUARD::QAR2(B),XR(c)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • K(d);P-FLIGHT::QAR1(B)
      • Refutation
        • K(d);P-FLIGHT
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • K(d);P-FLIGHT::QAR1(B)
        • B(a);XB(A)::QAR1(B)
      • Refutation
        • B(a);
    • Try
      • Q(B);
      • Threat
        • QAR1(B)
      • Vars
        • K(d);P-FLIGHT::QAR2(B)
        • K(d);0-0-0,OGATEB::QAB(B)
      • Refutation
        • B(a);
    • Try
      • Q(B);CHECK
      • Vars
        • K(d);P-FLIGHT::QAR1(B)
      • Refutation
        • K(d);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Refutation
        • K(d);P-FLIGHT
  • Actual
    • Q(B);
    • Threat
      • QAR(B)
    • Vars
      • K(d);P-FLIGHT::QAR(B)
      • K(d);P-FLIGHT::QAR2(B)
      • K(d);0-0-0,OGATEB::QAB(B)
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