MESON Chess Problem Database

Problem Display
PID: 98 (1bb2R2/3pp2K/7N/1R1N2Bk/r4Qp1/8/2n5/2q1nr2 w - - 0 1)

Loshinski, Lev Ilich

Umnov, Evgeny Ivanovich

Shakhmatny Listok, 1930

1bb2R2/3pp2K/7N/1R1N2Bk/r4Qp1/8/2n5/2q1nr2

#2

7 + 11

3098 FIDE Album (1914-1944) (I) 1971
5314 Grossmeister Shakhmatnoi Kompozitsii 1980
5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Qxg4#
    • 1...Ra2
      • 2.Qxg4#
    • 1...Ra3
      • 2.Qxg4#
    • 1...Ra5
      • 2.Qxg4#
    • 1...Ra6
      • 2.Qxg4#
    • 1...Ra7
      • 2.Qxg4#
    • 1...Ra8
      • 2.Qxg4#
    • 1...Sb4
      • 2.Qxg4#
    • 1...Sd4
      • 2.Qxg4#
    • 1...e5
      • 2.Sf6#
    • 1...e6
      • 2.Sf6#
  • Tries
    • 1.Qh2+?
      • 1...Kxg5
        • 2.Rg8#
      • 1...Bxh2!
  • Keys
    • 1.Bxe7!
      • threat
        • 2.Rf5#
      • 1...Qxf4
        • 2.Sxf4#
      • 1...Rfxf4
        • 2.Sxf4#
      • 1...Raxf4
        • 2.Sxf4#
      • 1...Bxf4
        • 2.Sxf4#
      • 1...Sf3
        • 2.Qf7#
      • 1...Se3
        • 2.Qg5#
      • 1...Sd4
        • 2.Qxg4#
      • 1...d6
        • 2.Qh2#

This anticipates 263748(1932)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 10
  • Sets
    • R(e);N_GUARD::QAB1(A),XP(f)
    • R(e);N_GUARD,SBLOCK::QAB1(A),XP(f)
    • S(d);S_CUTR(e)::QAB1(A),XP(f)
    • P(i);N_GUARD::S(C)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • K(g);P-FLIGHT,XB(D)::R(G)
      • Refutation
        • B(j);XQ(A)
  • Actual
    • B(D);XP(i)
    • Threat
      • R(G)
    • Vars
      • Q(a);XQ(A)::R(B)+S(C),DCHECK,XQ(a)
      • R(c);XQ(A)::R(B)+S(C),DCHECK,XR(c)
      • R(e);XQ(A)::R(B)+S(C),DCHECK,XR(e)
      • B(j);XQ(A)::R(B)+S(C),DCHECK,XB(j)
      • S(b);S_CUTR(c)::QAB(A)
      • S(d);S_CUTQ(a)::QAR1(A)
      • S(d);S_CUTR(e)::QAB1(A),XP(f)
      • P(h);S_CUTB(j)::QAR(A)
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