MESON Chess Problem Database

Problem Display
PID: 87415 (8/k1K5/r1p2Q2/8/8/8/8/3R4 w - - 0 1)

Alaikov, Venelin

Problemista, 1966

8/k1K5/r1p2Q2/8/8/8/8/3R4

#2

3 + 3

6490 yacpdb 2009
15148 Sadier Collection 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Rxa1#
      • 2.Qxa1#
  • Tries
    • 1.Qa1?
      • 1...Ka8
        • 2.Qxa6#
      • 1...Rxa1
        • 2.Rxa1#
      • 1...Ra2
        • 2.Qxa2#
      • 1...Ra3
        • 2.Qxa3#
      • 1...Ra4
        • 2.Qxa4#
      • 1...Ra5
        • 2.Qxa5#
      • 1...c5!
    • 1.Qb2?
      • threat
        • 2.Qb7#
        • 2.Qb8#
      • 1...Ka8
        • 2.Qb7#
        • 2.Qb8#
      • 1...Ra1
        • 2.Rxa1#
        • 2.Qxa1#
        • 2.Qb7#
      • 1...Ra2
        • 2.Qxa2#
        • 2.Qb7#
      • 1...Ra3
        • 2.Qxa3#
        • 2.Qb7#
      • 1...Ra4
        • 2.Qb7#
      • 1...Ra5
        • 2.Qb7#
      • 1...Rb6!
    • 1.Qf2+?
      • 1...Ka8
        • 2.Rd8#
      • 1...Rb6
        • 2.Ra1#
      • 1...c5!
  • Keys
    • 1.Ra1!
      • 1...Ka8
        • 2.Rxa6#
      • 1...Rxa1
        • 2.Qxa1#
      • 1...Ra2
        • 2.Rxa2#
      • 1...Ra3
        • 2.Rxa3#
      • 1...Ra4
        • 2.Rxa4#
      • 1...Ra5
        • 2.Rxa5#
      • 1...c5
        • 2.Rxa6#
        • 2.Qxa6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(B);P_PINR(a)
      • Vars
        • K(c);P-FLIGHT::QAR2(B),XR(a)
        • R(a);N_SPINR(a),OGATE,XQ(B)::R(A),XR(a)
        • R(a);OGATEB::QAR(B),XR(a)
        • R(a);OGATEB::QAR2(B),XR(a)
      • Refutation
        • P(b);
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • R(a);::QAR1(B)
      • Refutation
        • R(a);
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);P-FLIGHT::R(A)
        • R(a);P_SPINR(a),S_CUTP(b)::R(A)
      • Refutation
        • P(b);P_SPINP(b)
  • Actual
    • R(A);P_PINR(a)
    • Vars
      • K(c);P-FLIGHT::R(A),XR(a)
      • R(a);N_SPINR(a),OGATE,XR(A)::QAR(B),XR(a)
      • R(a);OGATEB::R(A),XR(a)
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