MESON Chess Problem Database

Problem Display
PID: 100842 (8/4K2p/1p2p1bP/2p1k3/2P1q1R1/3P4/2B2P2/1R2Q1B1 w - - 0 1)

Beach, Lennox F

Good Companions (March), 1917

8/4K2p/1p2p1bP/2p1k3/2P1q1R1/3P4/2B2P2/1R2Q1B1

#2

10 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kf5
      • 2.Qxe4#
    • 1...Bf5
      • 2.f4#
    • 1...Bh5
      • 2.Qxe4#
    • 1...Bf7
      • 2.Qxe4#
    • 1...Be8
      • 2.Qxe4#
  • Tries
    • 1.Bh2+?
      • 1...Kf5
        • 2.Qxe4#
      • 1...Kd4!
    • 1.Rxe4+?
      • 1...Bxe4
        • 2.Qxe4#
      • 1...Kf5!
    • 1.dxe4?
      • threat
        • 2.Qc3#
        • 2.f4#
      • 1...Bxe4
        • 2.Qxe4#
      • 1...Kd4!
    • 1.d4+?
      • 1...Kf5
        • 2.Qxe4#
      • 1...cxd4
        • 2.Rb5#
      • 1...Kxd4!
  • Keys
    • 1.Rb5!
      • 1...Kd4
        • 2.Qa1#
      • 1...Kf5
        • 2.Qxe4#
      • 1...Qxe1
        • 2.d4#
      • 1...Qe2
        • 2.d4#
      • 1...Qe3
        • 2.d4#
      • 1...Bf5
        • 2.f4#
      • 1...Bh5
        • 2.Qxe4#
      • 1...Bf7
        • 2.Qxe4#
      • 1...Be8
        • 2.Qxe4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • K(c);N_SPINQ(a),P-FLIGHT::QAB1(B),XQ(a)
    • B(f);SBLOCK::P(E)
    • B(f);N_GUARD::QAR1(B),XQ(a)
  • Tries
    • Try
      • B(C);CHECK
      • Vars
        • K(c);N_SPINQ(a),P-FLIGHT::QAB1(B),XQ(a)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • R(H);CHECK,XQ(a)
      • Vars
        • B(f);OGATE,P_SPINB(f),XR(H)::QAR1(B),XB(f)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • P(F);XQ(a)
      • Threat
        • DUALS(2)
      • Vars
        • B(f);OGATE,P_SPINB(f),XP(F)::QAR1(B),XB(f)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • P(F);CHECK
      • Vars
        • K(c);P-FLIGHT::QAB1(B),XQ(a)
        • P(b);SBLOCK,XP(F)::R(A)
      • Refutation
        • K(c);S_FLIGHT,XP(F)
  • Actual
    • R(A);P_PINP(b)
    • Vars
      • K(c);N_SPINP(b),S_FLIGHT::QAB(B)
      • K(c);N_SPINQ(a),P-FLIGHT::QAB1(B),XQ(a)
      • Q(a);N_SPINQ(a),XQ(B)::P(F)
      • Q(a);::P(F)
      • B(f);SBLOCK::P(E)
      • B(f);N_GUARD::QAR1(B),XQ(a)
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Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).