MESON Chess Problem Database

Problem Display
PID: 177962 (8/7Q/r1p1Np2/b1PPkpp1/1p5p/5Pn1/5K1B/3RN3 w - - 0 1)

Dombrovskis, Alfreds A

2nd Comm., Sahs (Latvia), 1987

8/7Q/r1p1Np2/b1PPkpp1/1p5p/5Pn1/5K1B/3RN3

#2

9 + 10

3713 Snap 2018
6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Rb6
      • 2.Qc7#
    • 1...Bc7
      • 2.Qxc7#
  • Tries
    • 1.Sg7?
      • threat
        • 2.Qxf5#
      • 1...Kf4
        • 2.Sd3#
        • 2.Qxf5#
      • 1...f4!
    • 1.Sf8?
      • threat
        • 2.Sg6#
      • 1...Kf4
        • 2.Sd3#
        • 2.Sg6#
      • 1...f4
        • 2.Sd7#
      • 1...cxd5!
    • 1.Bxg3+?
      • 1...f4
        • 2.Qe4#
      • 1...hxg3+!
    • 1.Qd7?
      • threat
        • 2.Sd3#
        • 2.Qd6#
      • 1...cxd5
        • 2.Sd3#
        • 2.Rxd5#
        • 2.Qxd5#
      • 1...Bc7
        • 2.Sd3#
        • 2.Qxc7#
      • 1...f4!
    • 1.f4+?
      • 1...Ke4
        • 2.Rd4#
      • 1...gxf4!
  • Keys
    • 1.Qe7!
      • threat
        • 2.Qd6#
      • 1...cxd5
        • 2.Sd3#
      • 1...f4
        • 2.Sg7#
      • 1...Bc7
        • 2.Qxc7#

This anticipates 147022(1995)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • R(h);S_CUTB(d)::QAB(I)
    • B(d);N_GUARD::QAB(I),XB(d)
  • Tries
    • Try
      • S(H);
      • Threat
        • QAR1(I),XP(f)
      • Refutation
        • P(f);N_SPINS(a)
    • Try
      • S(H);
      • Threat
        • S(H)
      • Vars
        • P(f);N_SPINS(a),SBLOCK::S(H)
      • Refutation
        • P(i);XP(G)
    • Try
      • B(D);CHECK,XS(a)
      • Vars
        • P(f);OGATE,P_SPINP(f)::QAR1(I)
      • Refutation
        • P(c);CHECK,XB(D)
    • Try
      • Q(I);
      • Threat
        • DUALS(2)
      • Refutation
        • P(f);N_SPINS(a)
    • Try
      • P(E);CHECK,N_PINS(a)
      • Vars
        • K(e);P-FLIGHT,P_SPINP(f)::R1(A)
      • Refutation
        • P(g);XP(E)
  • Actual
    • Q(I);
    • Threat
      • QAB1(I)
    • Vars
      • P(i);SBLOCK,XP(G)::S(B)
      • P(f);N_SPINS(a),SBLOCK::QAR(I)+S(H)
      • B(d);N_GUARD::QAB(I),XB(d)
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