MESON Chess Problem Database

Problem Display
PID: 110824 (1Q2R1qB/4pp2/4Pr2/1PNk1p1r/4Np2/1P2b2B/2K1R1P1/8 w - - 0 1)

Pituk, Alexander

Schweizer Arbeiter Schach, 1945

1Q2R1qB/4pp2/4Pr2/1PNk1p1r/4Np2/1P2b2B/2K1R1P1/8

#2

12 + 9

6490 yacpdb 2009
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qh7
      • 2.Rd8#
    • 1...Qxg2
      • 2.Rd8#
    • 1...Qg3
      • 2.Rd8#
    • 1...Qg4
      • 2.Rd8#
    • 1...Qg5
      • 2.Rd8#
    • 1...Qg6
      • 2.Rd8#
    • 1...Qg7
      • 2.Rd8#
    • 1...Rg6
      • 2.Qe5#
      • 2.Qb7#
      • 2.Qa8#
      • 2.Qd8#
    • 1...Rh6
      • 2.Qe5#
      • 2.Qb7#
      • 2.Qa8#
      • 2.Qd8#
    • 1...Bd2
      • 2.Rxd2#
  • Tries
    • 1.Bxf6?
      • threat
        • 2.Qe5#
        • 2.Qb7#
        • 2.Qa8#
        • 2.Qd8#
      • 1...Qxe8
        • 2.Qe5#
      • 1...Bxc5
        • 2.Sc3#
        • 2.Qe5#
      • 1...exf6
        • 2.Qd6#
      • 1...Bd4
        • 2.Qb7#
        • 2.Qa8#
        • 2.Qd8#
      • 1...fxe4!
  • Keys
    • 1.Sd3!
      • threat
        • 2.Qe5#
      • 1...Kd4
        • 2.Qe5#
      • 1...Kxe4
        • 2.Qe5#
      • 1...Kxe6
        • 2.Qd6#
      • 1...Rxe6
        • 2.Sc3#
      • 1...fxe4
        • 2.Qd8#
      • 1...Bd4
        • 2.Sxf4#

This anticipates 79795(1961), 104356(2003)

This is a version of 78890

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 8
  • Sets
    • Q(i);N_GUARD::R(K)
    • Q(i);N_GUARD,P_PINR(B),XP(C)::R(K)
    • B(a);N_GUARD::R(B),XB(a)
  • Tries
    • Try
      • B(L);XR(f)
      • Threat
        • DUALS(4)
      • Vars
        • Q(i);XR(K)::QAR1(J)
        • P(g);N_GUARD,XB(L)::QAR1(J)
      • Refutation
        • P(d);XS(F)
  • Actual
    • S(H);
    • Threat
      • QAR1(J)
    • Vars
      • K(c);P-FLIGHT,P_SPINR(f)::QAB1(J)
      • K(c);P_SPINB(a),S_FLIGHT,XS(F)::QAR1(J)
      • K(c);P_SPINP(d),S_FLIGHT,XP(I)::QAR1(J)
      • R(f);SBLOCK,XP(I)::S(F)
      • P(d);SBLOCK,XS(F)::QAR(J)
      • B(a);N_GUARD,SBLOCK::S(H),XP(b)
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