MESON Chess Problem Database

Problem Display
PID: 97938 (8/8/1N2NKp1/2P5/r3kB2/1p1n3R/7p/1b1Qr2q w - - 0 1)

Hermanson, Halvar

Problem (Zagreb), 1952

8/8/1N2NKp1/2P5/r3kB2/1p1n3R/7p/1b1Qr2q

#2

7 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qf3
      • 2.Qxf3#
    • 1...Qg1
      • 2.Qf3#
    • 1...Rxd1
      • 2.Re3#
    • 1...Rf1
      • 2.Re3#
      • 2.Qe2#
    • 1...Rg1
      • 2.Re3#
      • 2.Qe2#
    • 1...Re2
      • 2.Qxe2#
    • 1...Re3
      • 2.Rxe3#
    • 1...Ba2
      • 2.Qxd3#
    • 1...Sc1
      • 2.Qd5#
    • 1...Sb2
      • 2.Qd5#
    • 1...Sf2
      • 2.Qd5#
    • 1...Sb4
      • 2.Qd4#
    • 1...Sxf4
      • 2.Sg5#
    • 1...Sxc5
      • 2.Qd5#
    • 1...Se5
      • 2.Qd5#
  • Tries
    • 1.Qxb3?
      • threat
        • 2.Qd5#
      • 1...Sxf4
        • 2.Qxa4#
      • 1...Rc4
        • 2.Qxc4#
      • 1...Ba2
        • 2.Qxd3#
      • 1...Sb4
        • 2.Qc4#
      • 1...Rd4!
    • 1.Qh5?
      • threat
        • 2.Qxg6#
        • 2.Qd5#
      • 1...Sxf4
        • 2.Qe5#
      • 1...Qg2
        • 2.Qd5#
      • 1...Qg1
        • 2.Qf3#
        • 2.Qd5#
      • 1...Rg1
        • 2.Re3#
        • 2.Qe2#
        • 2.Qd5#
      • 1...Rd4
        • 2.Qxg6#
      • 1...Sb4
        • 2.Qxg6#
        • 2.Qe5#
      • 1...Se5
        • 2.Qxe5#
      • 1...g5
        • 2.Qg6#
        • 2.Qh7#
      • 1...gxh5!
    • 1.Qxe1+?
      • 1...Sxe1
        • 2.Re3#
      • 1...Qxe1!
  • Keys
    • 1.Qg4!
      • threat
        • 2.Qxg6#
      • 1...Sxf4
        • 2.Qxf4#
      • 1...Qg2
        • 2.Qxg2#
      • 1...Qg1
        • 2.Qf3#
      • 1...Rg1
        • 2.Re3#
        • 2.Qe2#
      • 1...Se5
        • 2.Bxe5#
      • 1...g5
        • 2.Qf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 10
  • Sets
    • Q(c);N_GUARD,P_PINB(C)::QAB1(A),XQ(c)
    • Q(c);N_GUARD::QAB1(A)
    • R(b);N_GUARD,XQ(A)::R1(B)
    • R(b);N_GUARD::QAR2(A),XR(b)
    • R(b);N_GUARD::R1(B),XR(b)
    • B(a);N_GUARD::QAB1(A),XS(f)
    • S(f);OGATE::QAB1(A)
    • S(f);OGATE::QAR1(A)
    • S(f);SBLOCK,XB(C)::S(F)
    • S(f);OGATE,XP(D)::QAB1(A)
  • Tries
    • Try
      • Q(A);XP(e)
      • Threat
        • QAB1(A)
      • Vars
        • S(f);N_GUARD,XB(C)::QAR(A),XR(g)
        • R(g);N_GUARD::QAR2(A),XR(g)
        • B(a);N_GUARD::QAB1(A),XS(f)
        • S(f);S_CUTR(g)::QAR2(A)
      • Refutation
        • R(g);
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • S(f);N_GUARD,XB(C)::QAR1(A)
        • Q(c);::QAB1(A)
        • R(g);::QAB(A),XP(i)
        • S(f);N_GUARD::QAR1(A),XS(f)
      • Refutation
        • P(i);XQ(A)
    • Try
      • Q(A);CHECK,XR(b)
      • Vars
        • S(f);XQ(A)::R1(B)
      • Refutation
        • Q(c);XQ(A)
  • Actual
    • Q(A);
    • Threat
      • QAB(A),XP(i)
    • Vars
      • S(f);OGATE,P_SPINS(f),XB(C)::QAR1(A),XS(f)
      • Q(c);N_GUARD::QAB(A),XQ(c)
      • Q(c);N_GUARD::QAB1(A)
      • S(f);N_GUARD::QAR(A)+B(C),XS(f)
      • P(i);N_GUARD::QAB1(A)
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