MESON Chess Problem Database

Problem Display
PID: 179803 (7K/8/8/2R5/3Q4/1p3N2/2q5/1rk5 w - - 0 1)

Zalkind, Lazar Borissovich

64 Shakhmatnoe obozrenie, 1925

7K/8/8/2R5/3Q4/1p3N2/2q5/1rk5

#2

4 + 4

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qc4
      • 2.Rxc4#
      • 2.Qd2#
    • 1...Qxc5
      • 2.Qd2#
    • 1...Ra1
      • 2.Qxa1#
    • 1...Rb2
      • 2.Qg1#
    • 1...b2
      • 2.Qg1#
      • 2.Qd2#
  • Tries
    • 1.Kg7?
      • 1...Qxc5
        • 2.Qd2#
      • 1...Qc4
        • 2.Rxc4#
        • 2.Qd2#
      • 1...Ra1
        • 2.Qxa1#
      • 1...Rb2
        • 2.Qg1#
      • 1...b2
        • 2.Qg1#
        • 2.Qd2#
      • 1...Qc3!
    • 1.Rxc2+?
      • 1...Kxc2
        • 2.Qd2#
      • 1...bxc2!
    • 1.Rc4?
      • 1...Qxc4
        • 2.Qd2#
      • 1...Ra1
        • 2.Qxa1#
      • 1...Rb2
        • 2.Qg1#
      • 1...b2
        • 2.Qg1#
        • 2.Qd2#
      • 1...Qc3!
    • 1.Rc6?
      • 1...Qxc6
        • 2.Qd2#
      • 1...Qc4
        • 2.Rxc4#
        • 2.Qd2#
      • 1...Qc5
        • 2.Rxc5#
        • 2.Qd2#
      • 1...Ra1
        • 2.Qxa1#
      • 1...Rb2
        • 2.Qg1#
      • 1...b2
        • 2.Qg1#
        • 2.Qd2#
      • 1...Qc3!
    • 1.Rc7?
      • 1...Qxc7
        • 2.Qd2#
      • 1...Qc4
        • 2.Rxc4#
        • 2.Qd2#
      • 1...Qc5
        • 2.Rxc5#
        • 2.Qd2#
      • 1...Qc6
        • 2.Rxc6#
        • 2.Qd2#
      • 1...Ra1
        • 2.Qxa1#
      • 1...Rb2
        • 2.Qg1#
      • 1...b2
        • 2.Qg1#
        • 2.Qd2#
      • 1...Qc3!
    • 1.Qc3?
      • 1...Kd1
        • 2.Qe1#
      • 1...Ra1
        • 2.Qxa1#
      • 1...Rb2
        • 2.Qe1#
      • 1...b2
        • 2.Qe1#
        • 2.Qd2#
        • 2.Qxc2#
      • 1...Qxc3+!
    • 1.Qe3+?
      • 1...Kd1
        • 2.Qe1#
      • 1...Kb2!
  • Keys
    • 1.Kg8!
      • 1...Qc4+
        • 2.Rxc4#
      • 1...Qxc5
        • 2.Qd2#
      • 1...Qc3
        • 2.Qd2#
      • 1...Ra1
        • 2.Qxa1#
      • 1...Rb2
        • 2.Qg1#
      • 1...b2
        • 2.Qg1#
        • 2.Qd2#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • Q(c);N_SPINQ(c),XR(C)::QAB1(B)
    • R(a);OGATEB::QAR2(B),XR(a)
    • R(a);SBLOCK::QAR(B)
  • Tries
    • Try
      • K(D);S_FLIGHT
      • Vars
        • Q(c);N_SPINQ(c),XR(C)::QAB1(B)
        • R(a);OGATEB::QAR2(B),XR(a)
        • R(a);SBLOCK::QAR(B)
      • Refutation
        • Q(c);P_PINQ(B)
    • Try
      • R(C);CHECK,XQ(c)
      • Vars
        • K(b);P-FLIGHT,XR(C)::QAR1(B)
      • Refutation
        • P(d);XR(C)
    • Try
      • R(C);
      • Vars
        • Q(c);N_SPINQ(c),XR(C)::QAB1(B)
        • R(a);OGATEB::QAR2(B),XR(a)
        • R(a);SBLOCK::QAR(B)
      • Refutation
        • Q(c);P_PINQ(B)
    • Try
      • R(C);
      • Vars
        • Q(c);N_SPINQ(c),XR(C)::QAB1(B)
        • R(a);OGATEB::QAR2(B),XR(a)
        • R(a);SBLOCK::QAR(B)
      • Refutation
        • Q(c);P_PINQ(B)
    • Try
      • R(C);
      • Vars
        • Q(c);N_SPINQ(c),XR(C)::QAB1(B)
        • R(a);OGATEB::QAR2(B),XR(a)
        • R(a);SBLOCK::QAR(B)
      • Refutation
        • Q(c);P_PINQ(B)
    • Try
      • Q(B);
      • Vars
        • K(b);N_SPINQ(c),P-FLIGHT::QAR1(B)
        • R(a);OGATEB::QAR2(B),XR(a)
        • R(a);SBLOCK::QAR2(B)
      • Refutation
        • Q(c);CHECK,XQ(B)
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);N_SPINQ(c),P-FLIGHT::QAR1(B)
      • Refutation
        • K(b);N_SPINQ(c),S_FLIGHT
  • Actual
    • K(D);P-FLIGHT
    • Vars
      • Q(c);CHECK,OGATEB::R(C),XQ(c)
      • Q(c);N_SPINQ(c),XR(C)::QAB1(B)
      • Q(c);::QAB1(B)
      • R(a);OGATEB::QAR2(B),XR(a)
      • R(a);SBLOCK::QAR(B)
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