MESON Chess Problem Database

Problem Display
PID: 10032 (Q7/8/4pR2/3r2p1/1p1P1nN1/1Rn2k1p/5N1K/2B2B2 w - - 0 1)

Jonsson, Gustav

3rd Prize, Problem (Zagreb), 1961

Q7/8/4pR2/3r2p1/1p1P1nN1/1Rn2k1p/5N1K/2B2B2

#2

9 + 8

SOLUTION

  • SOUND
  • Tries
    • 1.Ba3?
      • 1...bxa3
        • 2.Rxc3#
      • 1...e5!
    • 1.Bxf4?
      • threat
        • 2.Bc1#
        • 2.Bd2#
        • 2.Be3#
        • 2.Bg3#
        • 2.Be5#
        • 2.Bxg5#
        • 2.Bd6#
        • 2.Bc7#
        • 2.Bb8#
      • 1...e5
        • 2.Bc1#
        • 2.Bd2#
        • 2.Be3#
        • 2.Bg3#
        • 2.Bxe5#
        • 2.Bxg5#
      • 1...gxf4!
    • 1.Rxe6?
      • threat
        • 2.Re3#
      • 1...Sxe6
        • 2.Qxd5#
      • 1...Se2
        • 2.Bxe2#
        • 2.Qxd5#
      • 1...Sg2
        • 2.Be2#
        • 2.Qxd5#
      • 1...Sh5
        • 2.Be2#
        • 2.Qxd5#
      • 1...Sg6
        • 2.Be2#
        • 2.Qxd5#
      • 1...Sd3!
    • 1.Qa2?
      • threat
        • 2.Be2#
        • 2.Qe2#
      • 1...Re5
        • 2.Sxe5#
      • 1...Rf5!
  • Keys
    • 1.Rb2!
      • threat
        • 2.Se5#
      • 1...e5
        • 2.Sxe5#
      • 1...Se2
        • 2.Bxe2#
      • 1...Se4
        • 2.Be2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • B(A);
      • Vars
        • P(d);N_GUARD,XB(A)::R(E),XS(a)
      • Refutation
        • P(h);
    • Try
      • B(A);XS(e)
      • Threat
        • DUALS(9)
      • Refutation
        • P(g);P_SPINP(g),XB(A)
    • Try
      • R(H);XP(h)
      • Threat
        • R1(H)
      • Vars
        • S(e);N_GUARD,XR(H)::QAB(I),XR(f)
      • Refutation
        • S(e);N_SPINS(a)
    • Try
      • Q(I);N_PINR(f)
      • Threat
        • DUALS(2)
      • Vars
        • R(f);N_GUARD::S(G),XR(f)
      • Refutation
        • R(f);
  • Actual
    • R(E);N_PINS(a),P_PINS(e)
    • Threat
      • S(G)
    • Vars
      • P(h);::S(G),XP(h)
      • S(a);N_GUARD::B(B),XS(a)
      • S(a);N_GUARD,N_SPINR(f)::B(B)
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