MESON Chess Problem Database

Problem Display
PID: 232923 (8/8/7p/4R2K/8/5pk1/6N1/7Q w - - 0 1)

Evdokimov, Aleksey

Kudesnik, 2010

8/8/7p/4R2K/8/5pk1/6N1/7Q

#2

4 + 3

5454 Near Snap 2021
15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...f2
      • 2.Re3#
  • Tries
    • 1.Se1?
      • threat
        • 2.Qh4#
      • 1...Kf4
        • 2.Qh2#
      • 1...Kf2!
    • 1.Sh4?
      • 1...Kf2
        • 2.Qe1#
      • 1...Kf4
        • 2.Qh2#
      • 1...f2!
    • 1.Rg5+?
      • 1...Kf2
        • 2.Qe1#
      • 1...hxg5!
    • 1.Qg1?
      • 1...Kh3
        • 2.Sf4#
      • 1...f2
        • 2.Re3#
      • 1...fxg2!
  • Keys
    • 1.Sf4!
      • threat
        • 2.Qh4#
      • 1...Kf2
        • 2.Qe1#
      • 1...Kxf4
        • 2.Qh2#
      • 1...f2
        • 2.Se2#

Anticipated by 23568(2000), 175985(2009)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(a);OGATEB,SBLOCK::R(C)
  • Tries
    • Try
      • S(B);
      • Threat
        • QAB1(A)
      • Vars
        • K(b);S_FLIGHT::QAB(A)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • S(B);
      • Vars
        • K(b);S_FLIGHT::QAB1(A)
        • K(b);S_FLIGHT::QAB(A)
      • Refutation
        • P(a);
    • Try
      • R(C);CHECK
      • Vars
        • K(b);S_FLIGHT::QAB1(A)
      • Refutation
        • P(c);XR(C)
    • Try
      • Q(A);
      • Vars
        • K(b);P-FLIGHT::S(B)
        • P(a);OGATEB::R(C)
      • Refutation
        • P(a);P_SPINP(a),XS(B)
  • Actual
    • S(B);
    • Threat
      • QAB1(A)
    • Vars
      • K(b);S_FLIGHT::QAB1(A)
      • K(b);S_FLIGHT,XS(B)::QAB(A)
      • P(a);N_GUARD,SBLOCK::S(B)
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