MESON Chess Problem Database

Problem Display
PID: 179439 (qB3r2/2Rr2p1/1nb5/6b1/1Qn2kp1/5P1P/2B3P1/2N1RN1K w - - 0 1)

Adabashev, Mark Ivanovich

64 Shakhmatnoe obozrenie, 1937

qB3r2/2Rr2p1/1nb5/6b1/1Qn2kp1/5P1P/2B3P1/2N1RN1K

#2

11 + 10

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Rd1
      • 2.Rf7#
    • 1...Rd2
      • 2.Rf7#
    • 1...Rd3
      • 2.Rf7#
    • 1...Rd4
      • 2.Rf7#
    • 1...Rd5
      • 2.Rf7#
    • 1...Rxc7
      • 2.Bxc7#
    • 1...Rdf7
      • 2.Rxf7#
    • 1...Rdd8
      • 2.Rf7#
    • 1...Bxf3
      • 2.Rxc4#
    • 1...Ba4
      • 2.Rxc4#
    • 1...Bb5
      • 2.Rxc4#
    • 1...Bd5
      • 2.Rxc4#
    • 1...Bb7
      • 2.Rxc4#
    • 1...Sd5
      • 2.Qxc4#
    • 1...gxf3
      • 2.g3#
  • Tries
    • 1.Sd3+?
      • 1...Rxd3
        • 2.Rf7#
      • 1...Kf5!
    • 1.Rc8+?
      • 1...Rd6
        • 2.Bxd6#
      • 1...Rc7
        • 2.Bxc7#
      • 1...Qxb8!
    • 1.Qd2+?
      • 1...Rxd2
        • 2.Rf7#
      • 1...Se3
        • 2.Qxe3#
      • 1...Sxd2!
    • 1.Qxf8+?
      • 1...Rf7
        • 2.Rxf7#
      • 1...Bf6!
  • Keys
    • 1.Qb5!
      • threat
        • 2.Se2#
      • 1...Bxf3
        • 2.Rxc4#
      • 1...Bxb5
        • 2.Rxc4#
      • 1...gxf3
        • 2.g3#
      • 1...Rd2
        • 2.Rf7#
      • 1...Rd5
        • 2.Rf7#
      • 1...Re7
        • 2.Sd3#
      • 1...Re8
        • 2.Qf5#
      • 1...Bd5
        • 2.Rxc4#
      • 1...Sd5
        • 2.Qxc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 8
  • Sets
    • R(g);OGATE::B(K)+R(J),DCHECK
    • R(g);N_SPINS(a),OGATE::B(K)+R(J),DCHECK
    • R(g);OGATE,P_SPINR(g),XR(J)::B(K),XR(g)
    • R(g);OGATE::B(K)+R(J),DCHECK,XR(g)
    • B(f);OGATE,P_PINP(F),XP(G)::B(K)+R(J),DCHECK,XS(a)
    • B(f);OGATE::B(K)+R(J),DCHECK,XS(a)
    • S(e);N_GUARD,S_CUTB(f),S_CUTR(g)::QAR(I),XS(a)
    • P(c);SBLOCK,XP(G)::P(F)
  • Tries
    • Try
      • S(A);CHECK
      • Vars
        • R(g);OGATE,XS(A)::B(K)+R(J),DCHECK
      • Refutation
        • K(b);N_SPINS(a),P-FLIGHT
    • Try
      • R(J);CHECK
      • Vars
        • R(g);N_GUARD,P_SPINR(g)::B(K),XR(g)
      • Refutation
        • Q(i);XB(K)
    • Try
      • Q(I);CHECK,N_PINS(a)
      • Vars
        • R(g);OGATE,XQ(I)::B(K)+R(J),DCHECK
        • S(a);N_GUARD,P_SPINS(a)::QAB1(I),XS(a)
      • Refutation
        • S(a);XQ(I)
    • Try
      • Q(I);CHECK,N_PINS(a),XR(j)
      • Vars
        • R(g);OGATE,P_SPINR(g)::B(K)+R(J),DCHECK,XR(g)
      • Refutation
        • B(d);P_SPINB(d)
  • Actual
    • Q(I);N_PINS(a)
    • Threat
      • S(A)
    • Vars
      • B(f);OGATE,P_PINP(F),XP(G)::B(K)+R(J),DCHECK,XS(a)
      • B(f);OGATE,XQ(I)::B(K)+R(J),DCHECK,XS(a)
      • P(c);SBLOCK,XP(G)::P(F)
      • R(g);OGATE::B(K)+R(J),DCHECK
      • R(g);N_GUARD::S(A)
      • R(j);N_GUARD::QAR1(I)
      • B(f);OGATE::B(K)+R(J),DCHECK,XS(a)
      • S(e);N_GUARD,S_CUTB(f),S_CUTR(g)::QAR(I),XS(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).