MESON Chess Problem Database

Problem Display
PID: 147022 (8/Q7/2pN1p1r/1ppkPP1b/p5p1/1nP5/B1K5/3NR3 w - - 0 1)

Senkus, Raimondas

Australian Chess Problem Magazine, 1995

8/Q7/2pN1p1r/1ppkPP1b/p5p1/1nP5/B1K5/3NR3

#2

9 + 10

3713 Snap 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Rg6
      • 2.Qf7#
    • 1...Bf7
      • 2.Qxf7#
  • Tries
    • 1.Sb7?
      • threat
        • 2.Qxc5#
      • 1...Kc4
        • 2.Se3#
        • 2.Qxc5#
      • 1...c4!
    • 1.Sc8?
      • threat
        • 2.Sb6#
      • 1...Kc4
        • 2.Se3#
        • 2.Sb6#
      • 1...c4
        • 2.Se7#
      • 1...fxe5!
    • 1.Bxb3+?
      • 1...c4
        • 2.Qd4#
      • 1...axb3+!
    • 1.Qe7?
      • threat
        • 2.Se3#
        • 2.Qe6#
      • 1...fxe5
        • 2.Se3#
        • 2.Rxe5#
        • 2.Qxe5#
      • 1...Bf7
        • 2.Se3#
        • 2.Qxf7#
      • 1...c4!
    • 1.c4+?
      • 1...Kd4
        • 2.Re4#
      • 1...bxc4!
  • Keys
    • 1.Qd7!
      • threat
        • 2.Qe6#
      • 1...fxe5
        • 2.Se3#
      • 1...c4
        • 2.Sb7#
      • 1...Bf7
        • 2.Qxf7#

Anticipated by 177962(1987)

FEATURES

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