MESON Chess Problem Database

Problem Display
PID: 85287 (4B2k/7P/4P2K/4R3/3rQ3/8/8/B7 w - - 0 1)

Ivunin, Alexey Vsevolodovich

Na Smenu!, 1973

4B2k/7P/4P2K/4R3/3rQ3/8/8/B7

#2

7 + 2

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rxe4
      • 2.Rxe4#
    • 1...Rd5
      • 2.Rxd5#
    • 1...Rd6
      • 2.Rd5#
    • 1...Rd8
      • 2.Rd5#
  • Tries
    • 1.Qg6?
      • threat
        • 2.Qf6#
        • 2.Qg7#
        • 2.Qg8#
      • 1...Rf4
        • 2.Qg7#
        • 2.Qg8#
      • 1...Rg4
        • 2.Re4#
      • 1...Rd7
        • 2.Qg8#
      • 1...Rh4+!
    • 1.Qf4?
      • threat
        • 2.Qf6#
        • 2.Qf8#
      • 1...Rd7
        • 2.Qf8#
      • 1...Rxf4!
    • 1.Qg4?
      • threat
        • 2.Qg7#
        • 2.Qg8#
      • 1...Rd7
        • 2.Qg8#
      • 1...Rxg4!
  • Keys
    • 1.Qa8!
      • threat
        • 2.Bd7#
      • 1...Rh4+
        • 2.Bh5#
      • 1...Ra4
        • 2.Bxa4#
      • 1...Rb4
        • 2.Bb5#
      • 1...Rc4
        • 2.Bc6#
      • 1...Rf4
        • 2.Bf7#
      • 1...Rg4
        • 2.Bg6#
      • 1...Rd7
        • 2.Bxd7#
      • 1...Rd8
        • 2.Rd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 3
  • Sets
    • R(a);OGATE,XQ(B)::B(A)+R(C),XR(a)
    • R(a);OGATEB::B(A)+R(C),XR(a)
    • R(a);OGATEB,P_PINP(D)::B(A)+R(C)
    • R(a);OGATEB::B(A)+R(C)
  • Tries
    • Try
      • Q(B);
      • Threat
        • DUALS(3)
      • Vars
        • R(a);OGATEB::B(A)+R(C)
        • R(a);::QAR1(B)
      • Refutation
        • R(a);CHECK
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • R(a);::QAR2(B)
      • Refutation
        • R(a);XQ(B)
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • R(a);::QAR1(B)
      • Refutation
        • R(a);XQ(B)
  • Actual
    • Q(B);
    • Threat
      • QAR(B)+B(G)
    • Vars
      • R(a);CHECK,N_GUARD::QAR(B)+B(G)
      • R(a);N_GUARD::QAR(B)+B(G),XR(a)
      • R(a);N_GUARD::QAR(B)+B(G)
      • R(a);::QAR(B)+B(G),XR(a)
      • R(a);OGATEB::B(A)+R(C)
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