MESON Chess Problem Database

Problem Display
PID: 70792 (R5K1/p7/k4b2/3p4/1Q6/8/4n3/q4R2 w - - 0 1)

Ekstrom, Sven Johan Adrian

Mees, Wouter Jacob Gregorius

3rd Prize, Problemisten 05. TT, 1946-1947

R5K1/p7/k4b2/3p4/1Q6/8/4n3/q4R2

#2

4 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Qb1
      • 2.Rxf6#
    • 1...Qd1
      • 2.Rxf6#
    • 1...Qe1
      • 2.Rxf6#
    • 1...Qa2
      • 2.Rxf6#
    • 1...Qa3
      • 2.Rxf6#
    • 1...Bh4
      • 2.Rxa1#
    • 1...Bg5
      • 2.Rxa1#
    • 1...Be7
      • 2.Rxa1#
    • 1...Sc3
      • 2.Rxf6#
    • 1...Sd4
      • 2.Rxa1#
    • 1...d4
      • 2.Rxa1#
      • 2.Rxf6#
  • Tries
    • 1.Qb7+?
      • 1...Ka5
        • 2.Rxa7#
      • 1...Kxb7!
  • Keys
    • 1.Rb8!
      • threat
        • 2.Qb5#
      • 1...Qb2
        • 2.Qa4#
      • 1...Qb1
        • 2.Rxf6#
        • 2.Qa3#
        • 2.Qa4#
      • 1...Qa4
        • 2.Qxa4#
      • 1...Qa5
        • 2.Qb7#
      • 1...Sc3
        • 2.Rxf6#
      • 1...Sd4
        • 2.Rxa1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 8
  • Sets
    • Q(a);N_GUARD::R(A),XB(e)
    • B(e);N_GUARD::R(A),XQ(a)
    • S(b);S_CUTQ(a)::R(A),XB(e)
    • S(b);S_CUTB(e)::R(A),XQ(a)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • K(d);P-FLIGHT::R(C),XP(f)
      • Refutation
        • K(d);N_SPINP(f),S_FLIGHT,XQ(B)
  • Actual
    • R(C);N_PINP(f)
    • Threat
      • QAB1(B)
    • Vars
      • Q(a);N_GUARD::QAR2(B)
      • Q(a);N_GUARD::QAR2(B),XQ(a)
      • Q(a);SBLOCK::QAB1(B)
      • S(b);S_CUTQ(a)::R(A),XB(e)
      • S(b);S_CUTB(e)::R(A),XQ(a)
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