MESON Chess Problem Database

Problem Display
PID: 235656 (RRBKQ3/N7/NP1B4/k2P4/3r3r/5p2/2PPb3/2b2q2 w - - 0 1)

Hannelius, Jan Ingvar

Mat, 1979

RRBKQ3/N7/NP1B4/k2P4/3r3r/5p2/2PPb3/2b2q2

#2

12 + 7

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rd3
      • 2.Qb5#
    • 1...Rc4
      • 2.Qb5#
    • 1...Bc4
      • 2.Bb4#
  • Tries
    • 1.Sc7?
      • threat
        • 2.Sab5#
        • 2.Sc6#
      • 1...Bb5
        • 2.Saxb5#
        • 2.Sc6#
      • 1...Ba6!
    • 1.Sb5?
      • threat
        • 2.Sb4#
        • 2.Sac7#
      • 1...Ka4
        • 2.Sb4#
        • 2.Sac7#
      • 1...Rb4
        • 2.Sxb4#
        • 2.Sc5#
        • 2.Sac7#
      • 1...Rh7
        • 2.Sac7#
      • 1...Bxb5!
    • 1.c4?
      • threat
        • 2.Bb4#
        • 2.Qb5#
      • 1...Rxc4
        • 2.Qb5#
      • 1...Bxd2
        • 2.Qb5#
      • 1...Bxc4
        • 2.Bb4#
      • 1...Rh8
        • 2.Bb4#
      • 1...Ba3
        • 2.Qb5#
      • 1...Rxd5!
  • Keys
    • 1.Sc5!
      • threat
        • 2.Sb3#
      • 1...Kb4
        • 2.Qa4#
      • 1...Rd3
        • 2.Qb5#
      • 1...Rb4
        • 2.Sb5#
      • 1...Bc4
        • 2.Qa4#
      • 1...Bb5
        • 2.Sc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • R(e);S_CUTB(c)::QAR1(L)
    • B(c);S_CUTR(e)::B(F)
  • Tries
    • Try
      • S(D);
      • Threat
        • DUALS(2)
      • Refutation
        • B(c);
    • Try
      • S(G);
      • Threat
        • DUALS(2)
      • Vars
        • R(f);::R(H)+S(D)
      • Refutation
        • B(c);XS(G)
    • Try
      • P(A);
      • Threat
        • DUALS(2)
      • Vars
        • R(e);XP(A)::QAR1(L)
        • B(a);XP(B)::QAR1(L)
        • B(c);XP(A)::B(F)
        • R(f);P_PINQ(L)::B(F)
        • B(a);::QAR1(L)
      • Refutation
        • R(e);P_PINB(F),XP(C)
  • Actual
    • S(D);
    • Threat
      • S(D)
    • Vars
      • K(g);S_FLIGHT::QAR1(L)
      • R(e);S_CUTB(c)::QAR1(L)
      • R(e);SBLOCK::R(H)+S(G)
      • B(c);S_CUTR(e)::QAR1(L)
      • B(c);SBLOCK::R(H)+S(G),DCHECK
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