MESON Chess Problem Database

Problem Display
PID: 93287 (8/8/5p2/2n1k3/3R4/5K2/B4Q2/8 w - - 0 1)

Kjaer, Harald

Arbejder-Skak, 1967

8/8/5p2/2n1k3/3R4/5K2/B4Q2/8

#2

4 + 3

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Se6
      • 2.Rd5#
  • Tries
    • 1.Qe1+?
      • 1...Kxd4
        • 2.Qe3#
      • 1...Se4
        • 2.Qxe4#
      • 1...Kf5!
    • 1.Qe3+?
      • 1...Se4
        • 2.Qxe4#
      • 1...Kf5!
    • 1.Qe2+?
      • 1...Kxd4
        • 2.Qe3#
      • 1...Se4
        • 2.Qxe4#
      • 1...Kf5!
    • 1.Qh2+?
      • 1...Kf5
        • 2.Qh5#
      • 1...Kxd4!
  • Keys
    • 1.Qh4!
      • threat
        • 2.Qf4#
      • 1...Kf5
        • 2.Qh5#
      • 1...Sb3
        • 2.Qe4#
      • 1...Se4
        • 2.Qxe4#
      • 1...Se6
        • 2.Rd5#
        • 2.Qe4#
      • 1...Sd3
        • 2.Qe4#
      • 1...f5
        • 2.Qh8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • S(a);SBLOCK::R1(D)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);S_FLIGHT,XR(D)::QAB1(B)
        • S(a);N_GUARD,P_SPINS(a)::QAR1(B),XS(a)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAR1(B),XS(a)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);S_FLIGHT,XR(D)::QAB1(B)
        • S(a);N_GUARD,P_SPINS(a)::QAR1(B),XS(a)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR2(B)
      • Refutation
        • K(b);S_FLIGHT,XR(D)
  • Actual
    • Q(B);
    • Threat
      • QAB1(B)
    • Vars
      • K(b);P-FLIGHT::QAR2(B)
      • S(a);N_GUARD::QAR1(B)
      • S(a);N_GUARD::QAR1(B),XS(a)
      • P(c);OGATEB,SBLOCK::QAB(B)
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