MESON Chess Problem Database

Problem Display
PID: 177756 (8/8/6b1/8/3K4/8/k7/1R5Q w - - 0 1)

Pronin, Valery

Sahs (Latvia), 1987

8/8/6b1/8/3K4/8/k7/1R5Q

#2

3 + 2

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Ka3
      • 2.Qa8#
  • Tries
    • 1.Rb2+?
      • 1...Ka3
        • 2.Qa1#
      • 1...Kxb2!
    • 1.Qd5+?
      • 1...Ka3
        • 2.Qb3#
        • 2.Qa8#
        • 2.Qa5#
      • 1...Kxb1!
    • 1.Qb7?
      • threat
        • 2.Qb2#
        • 2.Qb3#
      • 1...Ka3
        • 2.Ra1#
        • 2.Qa6#
        • 2.Qa8#
        • 2.Qb3#
        • 2.Qa7#
      • 1...Bc2
        • 2.Qb2#
      • 1...Bf7
        • 2.Qb2#
      • 1...Bxb1!
  • Keys
    • 1.Kc3!
      • threat
        • 2.Ra1#
      • 1...Ka3
        • 2.Ra1#
        • 2.Qa8#
      • 1...Bxb1
        • 2.Qa8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • K(a);P-FLIGHT::QAR(B)
  • Tries
    • Try
      • R(A);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR2(B)
      • Refutation
        • K(a);P-FLIGHT,XR(A)
    • Try
      • Q(B);CHECK
      • Refutation
        • K(a);S_FLIGHT,XR(A)
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • B(b);::QAR1(B)
      • Refutation
        • B(b);XR(A)
  • Actual
    • K(C);S_FLIGHT
    • Threat
      • R1(A)
    • Vars
      • B(b);SBLOCK,XR(A)::QAR(B)
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