MESON Chess Problem Database

Problem Display
PID: 179656 (B7/8/7n/3R4/4Rb2/6PK/1qPPNP2/Q1N4k w - - 0 1)

Gorbatenko, Yuri Grigorevich

Kopnin, Aleksey Grigorevich

Comm., Schach, 1985

B7/8/7n/3R4/4Rb2/6PK/1qPPNP2/Q1N4k

#2

11 + 4

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc1
      • 2.Qxc1#
    • 1...Qa2
      • 2.Sxa2#
    • 1...Qb3
      • 2.Sxb3#
    • 1...Qb4
      • 2.Sb3#
    • 1...Qb5
      • 2.Sb3#
    • 1...Qb6
      • 2.Sb3#
    • 1...Qb7
      • 2.Sb3#
    • 1...Qb8
      • 2.Sb3#
  • Tries
    • 1.Sa2+?
      • 1...Qc1
        • 2.Qxc1#
      • 1...Qb1
        • 2.Qxb1#
      • 1...Qxa1!
    • 1.Sb3+?
      • 1...Qc1
        • 2.Qxc1#
      • 1...Qb1
        • 2.Qxb1#
      • 1...Qxa1!
    • 1.Sd3+?
      • 1...Qc1
        • 2.Qxc1#
      • 1...Qb1
        • 2.Qxb1#
      • 1...Qxa1!
    • 1.Re3?
      • threat
        • 2.Rb5#
      • 1...Qxa1
        • 2.Ra5#
      • 1...Qa3
        • 2.Ra5#
      • 1...Qc3
        • 2.Rc5#
      • 1...Qd4
        • 2.Rxd4#
      • 1...Qe5
        • 2.Rdxe5#
      • 1...Qf6
        • 2.Rd6#
      • 1...Qg7
        • 2.Rd7#
      • 1...Qh8
        • 2.Rd8#
      • 1...Qa2
        • 2.Sxa2#
      • 1...Qb3
        • 2.Sxb3#
      • 1...Qb4
        • 2.Sb3#
      • 1...Qb5
        • 2.Sb3#
        • 2.Rxb5#
      • 1...Qb6
        • 2.Sb3#
      • 1...Qb7
        • 2.Sb3#
      • 1...Qb8
        • 2.Sb3#
      • 1...Qxc2!
    • 1.Rc4?
      • threat
        • 2.Rb5#
      • 1...Qxa1
        • 2.Ra5#
      • 1...Qxc2
        • 2.Rd3#
      • 1...Qc3
        • 2.Rd3#
      • 1...Qd4
        • 2.Rdxd4#
      • 1...Qe5
        • 2.Rxe5#
      • 1...Qf6
        • 2.Rd6#
      • 1...Qg7
        • 2.Rd7#
      • 1...Qh8
        • 2.Rd8#
      • 1...Qa2
        • 2.Sxa2#
        • 2.Ra5#
      • 1...Qb3
        • 2.Sxb3#
      • 1...Qb5
        • 2.Sb3#
        • 2.Rxb5#
      • 1...Qb6
        • 2.Sb3#
      • 1...Qb7
        • 2.Sb3#
      • 1...Qb8
        • 2.Sb3#
      • 1...Qa3!
  • Keys
    • 1.Rd3!
      • threat
        • 2.Rb4#
      • 1...Qxa1
        • 2.Ra4#
      • 1...Qxc2
        • 2.Rc4#
      • 1...Qa3
        • 2.Ra4#
      • 1...Qc3
        • 2.Rc4#
      • 1...Qd4
        • 2.Rexd4#
      • 1...Qe5
        • 2.Rxe5#
      • 1...Qf6
        • 2.Re6#
      • 1...Qg7
        • 2.Re7#
      • 1...Qh8
        • 2.Re8#
      • 1...Qa2
        • 2.Sxa2#
      • 1...Qb3
        • 2.Sxb3#
      • 1...Qb4
        • 2.Sb3#
        • 2.Rxb4#
      • 1...Qb5
        • 2.Sb3#
      • 1...Qb6
        • 2.Sb3#
      • 1...Qb7
        • 2.Sb3#
      • 1...Qb8
        • 2.Sb3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 9
    • REMOVED MATES = 2
  • Sets
    • Q(b);OGATE,P_SPINQ(b),XS(B)::QAR(A),XQ(b)
    • Q(b);N_GUARD::QAR(A)+S(B),XQ(b)
    • Q(b);N_GUARD,P_PINP(G)::QAR(A)+S(B),XQ(b)
    • Q(b);N_GUARD::QAR(A)+S(B)
  • Tries
    • Try
      • S(B);CHECK
      • Vars
        • Q(b);N_GUARD,P_SPINQ(b)::QAR(A),XQ(b)
      • Refutation
        • Q(b);XQ(A)
    • Try
      • S(B);CHECK
      • Vars
        • Q(b);N_GUARD,P_SPINQ(b)::QAR(A),XQ(b)
      • Refutation
        • Q(b);XQ(A)
    • Try
      • S(B);CHECK
      • Vars
        • Q(b);N_GUARD,P_SPINQ(b)::QAR(A),XQ(b)
      • Refutation
        • Q(b);XQ(A)
    • Try
      • R(I);
      • Threat
        • B(K)+R(J)
      • Vars
        • Q(b);N_GUARD,XQ(A)::B(K)+R(J)
        • Q(b);N_GUARD::B(K)+R(J)
        • Q(b);N_GUARD::B(K)+R(J),XQ(b)
        • Q(b);N_GUARD::QAR(A)+S(B),XQ(b)
        • Q(b);N_GUARD::QAR(A)+S(B)
      • Refutation
        • Q(b);XP(C)
    • Try
      • R(I);
      • Threat
        • B(K)+R(J)
      • Vars
        • Q(b);N_GUARD,XQ(A)::B(K)+R(J)
        • Q(b);N_GUARD,XP(C)::B(K)+R(J)
        • Q(b);N_GUARD,P_PINP(G)::B(K)+R(J)
        • Q(b);N_GUARD::B(K)+R(J),XQ(b)
        • Q(b);N_GUARD::B(K)+R(J)
        • Q(b);N_GUARD,P_PINP(G)::QAR(A)+S(B),XQ(b)
        • Q(b);N_GUARD::QAR(A)+S(B)
      • Refutation
        • Q(b);P_PINP(G)
  • Actual
    • R(J);
    • Threat
      • B(K)+R(I)
    • Vars
      • Q(b);N_GUARD,XQ(A)::B(K)+R(I)
      • Q(b);N_GUARD,XP(C)::B(K)+R(I)
      • Q(b);N_GUARD::B(K)+R(I)
      • Q(b);N_GUARD::B(K)+R(I),XQ(b)
      • Q(b);N_GUARD::QAR(A)+S(B),XQ(b)
      • Q(b);N_GUARD::QAR(A)+S(B)
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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).