MESON Chess Problem Database

Problem Display
PID: 52262 (1BB3R1/4b3/2Q1Np2/2RPqk2/5P2/2P1p3/K3P3/8 w - - 0 1)

Alvey, George Clarence Vincent

HM., Chess Amateur (The), 1911-1912

1BB3R1/4b3/2Q1Np2/2RPqk2/5P2/2P1p3/K3P3/8

#2

11 + 5

5293 A selection of chess problems by G. C. Alvey 2004
136 Problem Observer 2008
15148 Sadier Collection 2016

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc3
      • 2.Sg5#
    • 1...Qd4
      • 2.Sg5#
    • 1...Qxf4
      • 2.Sg5#
    • 1...Qc7
      • 2.d6#
    • 1...Qxb8
      • 2.d6#
    • 1...Qe4
      • 2.Sd4#
    • 1...Qxd5+
      • 2.Qxd5#
    • 1...Qxe6
      • 2.Qxe6#
  • Tries
    • 1.Sd4+?
      • 1...Kxf4
        • 2.Rg4#
      • 1...Ke4!
    • 1.Sg5+?
      • 1...Qe6
        • 2.Bxe6#
        • 2.Qxe6#
      • 1...Kxf4!
    • 1.Sd8+?
      • 1...Kxf4
        • 2.Rc4#
        • 2.Rg4#
        • 2.Qa4#
      • 1...Qe6
        • 2.Qxe6#
      • 1...Ke4!
    • 1.Sf8+?
      • 1...Kxf4
        • 2.Rc4#
        • 2.Rg4#
        • 2.Qa4#
      • 1...Qe6
        • 2.Qxe6#
      • 1...Ke4!
  • Keys
    • 1.Qb7!
      • 1...Qxd5+
        • 2.Qxd5#
      • 1...Ke4
        • 2.Qb1#
      • 1...Qxc3
        • 2.Sg5#
      • 1...Qxf4
        • 2.Sg5#
      • 1...Qxb8
        • 2.d6#
      • 1...Qxe6
        • 2.Qb1#
      • 1...Bxc5
        • 2.Qh7#
      • 1...Qd4
        • 2.Sg5#
      • 1...Qd6
        • 2.Qb1#
      • 1...Qc7
        • 2.Qb1#
      • 1...Qe4
        • 2.Sd4#
      • 1...Bd6
        • 2.Qh7#
      • 1...Bd8
        • 2.Qh7#
      • 1...Bf8
        • 2.Qh7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • Q(b);N_GUARD,XP(C)::B(J)+S(H)
    • Q(b);N_GUARD::B(J)+S(H)
    • Q(b);N_GUARD,XP(D)::B(J)+S(H)
    • Q(b);::R(E)+P(F)
    • Q(b);XB(I)::R(E)+P(F)
    • Q(b);SBLOCK::B(J)+S(H),DCHECK
    • Q(b);CHECK,OGATE,P_SPINQ(b),XP(F)::QAR2(G),XQ(b)
    • Q(b);OGATE,P_PINP(F),P_SPINQ(b),XS(H)::QAB1(G),XQ(b)
  • Tries
    • Try
      • S(H);CHECK
      • Vars
        • K(c);P-FLIGHT,P_SPINQ(b),XP(D)::R1(K)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • S(H);CHECK
      • Refutation
        • K(c);P-FLIGHT,P_SPINQ(b),XP(D)
    • Try
      • S(H);CHECK
      • Vars
        • Q(b);N_GUARD,P_PINP(F),P_SPINQ(b)::QAB1(G),XQ(b)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • S(H);CHECK
      • Vars
        • Q(b);N_GUARD,P_PINP(F),P_SPINQ(b)::QAB1(G),XQ(b)
      • Refutation
        • K(c);S_FLIGHT
  • Actual
    • Q(G);
    • Vars
      • Q(b);CHECK,OGATE,P_SPINQ(b),XP(F)::QAR2(G),XQ(b)
      • K(c);S_FLIGHT::QAB(G)
      • Q(b);N_GUARD,XP(C)::B(J)+S(H)
      • Q(b);N_GUARD,XP(D)::B(J)+S(H)
      • Q(b);XB(I)::R(E)+P(F)
      • Q(b);N_GUARD,P_PINP(F),P_SPINQ(b),XS(H)::QAB(G)
      • B(e);OGATE,XR(E)::QAB(G)
      • Q(b);N_GUARD::B(J)+S(H)
      • Q(b);N_GUARD::QAB(G)
      • Q(b);SBLOCK::B(J)+S(H),DCHECK
      • B(e);OGATE::QAB(G)
HTML5 logo

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).