MESON Chess Problem Database

Problem Display
PID: 234716 (8/8/8/4Q3/n1p5/8/knK5/1R6 w - - 0 1)

Lincoln, Robert A

Kudesnik, 2013

8/8/8/4Q3/n1p5/8/knK5/1R6

#2

3 + 4

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sd1
      • 2.Ra1#
      • 2.Qa1#
    • 1...Sd3
      • 2.Ra1#
      • 2.Qa1#
    • 1...Sc5
      • 2.Qxb2#
    • 1...Sb6
      • 2.Qxb2#
  • Tries
    • 1.Rxb2+?
      • 1...Ka1
        • 2.Qe1#
      • 1...Sxb2
        • 2.Qxb2#
      • 1...Ka3!
    • 1.Qc3?
      • 1...Sd1
        • 2.Ra1#
        • 2.Qa1#
      • 1...Sd3
        • 2.Ra1#
        • 2.Qa1#
      • 1...Sc5
        • 2.Qxb2#
      • 1...Sb6
        • 2.Qxb2#
      • 1...Sxc3!
    • 1.Qe1?
      • threat
        • 2.Ra1#
      • 1...Ka3
        • 2.Ra1#
      • 1...Sd1!
    • 1.Qa5?
      • 1...Ka3
        • 2.Ra1#
      • 1...Sd1
        • 2.Qxa4#
      • 1...Sd3
        • 2.Qxa4#
      • 1...c3!
  • Keys
    • 1.Qb5!
      • 1...Ka3
        • 2.Ra1#
      • 1...Sd1
        • 2.Qxa4#
      • 1...Sd3
        • 2.Qxa4#
      • 1...Sc3
        • 2.Qxb2#
      • 1...Sc5
        • 2.Qxb2#
      • 1...Sb6
        • 2.Qxb2#
      • 1...c3
        • 2.Qb3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • S(c);N_GUARD::QAR1(C),XS(b)
  • Tries
    • Try
      • R(A);CHECK,XS(b)
      • Vars
        • K(a);P-FLIGHT::QAR(C)
        • S(c);OGATE,XR(A)::QAR1(C),XS(c)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(C);
      • Vars
        • S(c);N_GUARD::QAR1(C),XS(b)
      • Refutation
        • S(c);XQ(C)
    • Try
      • Q(C);
      • Threat
        • R1(A)
      • Vars
        • K(a);P-FLIGHT::R(A)
      • Refutation
        • S(b);
    • Try
      • Q(C);P_PINS(c)
      • Vars
        • K(a);P-FLIGHT::R(A)
        • S(b);N_GUARD::QAR2(C),XS(c)
      • Refutation
        • P(d);
  • Actual
    • Q(C);
    • Vars
      • K(a);P-FLIGHT::R(A)
      • S(b);N_GUARD::QAR2(C),XS(c)
      • S(c);N_GUARD::QAR1(C),XS(b)
      • P(d);N_GUARD::QAB1(C)
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