MESON Chess Problem Database

Problem Display
PID: 250099 (1Kb5/1p1rN3/1B4p1/2R2P2/1pB2RrP/2p1k1b1/7q/3Q4 w - - 0 1)

Mari, Alberto

5th Prize, 64 Shakhmatnoe obozrenie, 1927

1Kb5/1p1rN3/1B4p1/2R2P2/1pB2RrP/2p1k1b1/7q/3Q4

#2

9 + 10

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qd2
      • 2.Qf3#
    • 1...Rxf4
      • 2.Re5#
    • 1...Rd2
      • 2.Qf3#
    • 1...Rd4
      • 2.Qxd4#
    • 1...Rd5
      • 2.Sxd5#
    • 1...Rc7
      • 2.Sd5#
      • 2.Qd4#
    • 1...Rxe7
      • 2.Qd4#
    • 1...Bxf4+
      • 2.Re5#
  • Tries
    • 1.Ra5+?
      • 1...Rd4
        • 2.Sd5#
        • 2.Qxd4#
      • 1...Kxf4!
    • 1.Rb5+?
      • 1...Rd4
        • 2.Sd5#
        • 2.Qxd4#
      • 1...Kxf4!
    • 1.Rc6+?
      • 1...Rd4
        • 2.Sd5#
        • 2.Qxd4#
      • 1...Kxf4!
    • 1.Rc7+?
      • 1...Rd4
        • 2.Sd5#
        • 2.Qxd4#
      • 1...Kxf4!
    • 1.Rxc8+?
      • 1...Rd4
        • 2.Sd5#
        • 2.Qxd4#
      • 1...Kxf4!
    • 1.Qc1+?
      • 1...Rd2
        • 2.Sd5#
      • 1...Qd2!
  • Keys
    • 1.Bd5!
      • threat
        • 2.Rc4#
      • 1...Bxf4+
        • 2.Rc7#
      • 1...Kxf4
        • 2.Qd4#
      • 1...Rxf4
        • 2.Rxc3#
      • 1...Rxd5
        • 2.Sxd5#
      • 1...Qd2
        • 2.Qf3#
      • 1...Rd6
        • 2.Rf3#
      • 1...Rc7
        • 2.Rf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • Q(a);SBLOCK::QAR1(A)
    • R(f);SBLOCK,XR(C)::B(G)+R(E),DCHECK
    • R(i);SBLOCK::QAR1(A)
    • R(i);N_GUARD::QAB1(A),XR(i)
    • R(i);N_GUARD::S(H),XR(i)
    • R(i);N_GUARD,XS(H)::QAB1(A)
    • B(d);CHECK,SBLOCK,XR(C)::B(G)+R(E),DCHECK
  • Tries
    • Try
      • R(E);CHECK
      • Refutation
        • K(c);S_FLIGHT,XR(C)
    • Try
      • R(E);CHECK
      • Refutation
        • K(c);S_FLIGHT,XR(C)
    • Try
      • R(E);CHECK
      • Refutation
        • K(c);S_FLIGHT,XR(C)
    • Try
      • R(E);CHECK,N_SPINR(C)
      • Refutation
        • K(c);S_FLIGHT,XR(C)
    • Try
      • R(E);CHECK,XB(j)
      • Refutation
        • K(c);S_FLIGHT,XR(C)
    • Try
      • Q(A);CHECK
      • Vars
        • R(i);P_SPINR(i)::S(H)
      • Refutation
        • Q(a);P_SPINQ(a)
  • Actual
    • B(B);
    • Threat
      • B(G)+R(E)
    • Vars
      • B(d);CHECK,SBLOCK,XR(C)::B(G)+R(E)
      • K(c);N_GUARD,S_FLIGHT,XR(C)::QAR2(A)
      • R(f);SBLOCK,XR(C)::B(G)+R(E),DCHECK,XP(b)
      • R(i);XB(B)::S(H),XR(i)
      • Q(a);SBLOCK::QAR1(A)
      • R(i);N_PINR(C)::R1(C)
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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).