MESON Chess Problem Database

Problem Display
PID: 4695 (1B6/1Q6/4rp2/2kN4/8/2K1p3/8/8 w - - 0 1)

Boardman, Harry

Detroit Free Press, 1887

1B6/1Q6/4rp2/2kN4/8/2K1p3/8/8

#2

4 + 4

3360 Simple Two-move Themes 1924
3310 2345 Chess Problems 1997
5454 Near Snap 2007

SOLUTION

  • SOUND
  • Tries
    • 1.Sb4?
      • threat
        • 2.Sd3#
      • 1...Rb6
        • 2.Qd5#
      • 1...Rc6
        • 2.Qxc6#
      • 1...Rd6!
    • 1.Sf4?
      • threat
        • 2.Sd3#
        • 2.Sxe6#
      • 1...Rb6
        • 2.Qd5#
      • 1...Re4
        • 2.Sd3#
      • 1...Re5
        • 2.Sd3#
      • 1...Ra6
        • 2.Sd3#
      • 1...Rc6
        • 2.Qb4#
      • 1...Re7
        • 2.Sd3#
      • 1...Re8
        • 2.Sd3#
      • 1...Rd6!
    • 1.Se7?
      • threat
        • 2.Qb4#
      • 1...Rb6
        • 2.Qd5#
      • 1...Re4
        • 2.Qc6#
      • 1...Rxe7!
    • 1.Qb4+?
      • 1...Kxd5
        • 2.Qc4#
      • 1...Kc6!
    • 1.Qc7+?
      • 1...Kxd5
        • 2.Qc4#
      • 1...Rc6
        • 2.Qa5#
      • 1...Kb5!
  • Keys
    • 1.Sc7!
      • threat
        • 2.Sxe6#
      • 1...Kd6
        • 2.Sa6#
      • 1...Rd6
        • 2.Qb5#
      • 1...Re4
        • 2.Sa6#
      • 1...Re5
        • 2.Sa6#
      • 1...Ra6
        • 2.Sxa6#
      • 1...Rb6
        • 2.Qd5#
      • 1...Rc6
        • 2.Qb4#
      • 1...Re7
        • 2.Sa6#
      • 1...Re8
        • 2.Sa6#

This anticipates 120949(1901), 52598(1960), 238658(1970), 102478(1975), 187410(2014)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 9
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(B);
      • Threat
        • S(B)
      • Vars
        • R(c);SBLOCK::QAR1(C)
        • R(c);N_GUARD::QAR1(C),XR(c)
      • Refutation
        • R(c);
    • Try
      • S(B);
      • Threat
        • DUALS(2)
      • Vars
        • R(c);SBLOCK::QAR1(C)
        • R(c);::S(B)
        • R(c);SBLOCK::QAB1(C)
      • Refutation
        • R(c);
    • Try
      • S(B);
      • Threat
        • QAB1(C)
      • Vars
        • R(c);SBLOCK::QAR1(C)
        • R(c);N_GUARD::QAR1(C)
      • Refutation
        • R(c);XS(B)
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);P-FLIGHT,XS(B)::QAB1(C)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);OGATE,P-FLIGHT,XS(B)::QAB1(C)
        • R(c);P_SPINR(c),SBLOCK::QAR2(C)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • S(B);
    • Threat
      • S(B),XR(c)
    • Vars
      • K(b);S_FLIGHT::B(D)+S(B)
      • R(c);SBLOCK::QAR1(C)
      • R(c);N_GUARD::S(B)
      • R(c);N_GUARD::S(B),XR(c)
      • R(c);SBLOCK::QAB1(C)
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