MESON Chess Problem Database

Problem Display
PID: 99686 (B7/4p1n1/3P2Q1/3pBn2/R1NNk2p/2Ppp2K/3Pq1P1/4R3 w - - 0 1)

Hermanson, Halvar

Magyar Sakkelet, 1973

B7/4p1n1/3P2Q1/3pBn2/R1NNk2p/2Ppp2K/3Pq1P1/4R3

#2

12 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qd1
      • 2.Rxe3#
    • 1...Qf1
      • 2.Rxe3#
    • 1...Qf3+
      • 2.gxf3#
    • 1...Qg4+
      • 2.Qxg4#
    • 1...Qh5
      • 2.Rxe3#
    • 1...Qxe1
      • 2.Qg4#
    • 1...Qxd2
      • 2.Qg4#
    • 1...Qxg2+
      • 2.Qxg2#
    • 1...Sh5
      • 2.Qxf5#
    • 1...Se6
      • 2.Qxf5#
    • 1...Se8
      • 2.Qxf5#
    • 1...exd2
      • 2.Qg4#
  • Tries
    • 1.Rxe2?
      • threat
        • 2.Rxe3#
        • 2.Qg4#
      • 1...Sh5
        • 2.Rxe3#
        • 2.Qxf5#
      • 1...Se6
        • 2.Rxe3#
        • 2.Qxf5#
      • 1...dxe2!
    • 1.Ra5?
      • threat
        • 2.Bxd5#
      • 1...Qf3+
        • 2.gxf3#
      • 1...Qg4+
        • 2.Qxg4#
      • 1...Qxg2+
        • 2.Qxg2#
      • 1...e6!
    • 1.dxe7?
      • 1...Qf3+
        • 2.gxf3#
      • 1...Qg4+
        • 2.Qxg4#
      • 1...Qxg2+
        • 2.Qxg2#
      • 1...Qxe1
        • 2.Qg4#
      • 1...Qxd2
        • 2.Qg4#
      • 1...exd2
        • 2.Qg4#
      • 1...Qd1
        • 2.Rxe3#
      • 1...Qf1
        • 2.Rxe3#
      • 1...Qh5
        • 2.Rxe3#
      • 1...Sh5
        • 2.Qxf5#
      • 1...Se6
        • 2.Qxf5#
      • 1...Se8
        • 2.Qxf5#
      • 1...Qf2!
  • Keys
    • 1.Sxe3!
      • threat
        • 2.Sf3#
      • 1...Qf3+
        • 2.Sxf3#
      • 1...Qg4+
        • 2.Sxg4#
      • 1...Qxg2+
        • 2.Sxg2#
      • 1...Kxe5
        • 2.Sc6#
      • 1...Qd1
        • 2.Sxd1#
      • 1...Se6
        • 2.Qxf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 4
    • ADDED MATES = 1
    • REMOVED MATES = 7
  • Sets
    • Q(a);N_SPINP(f),OGATE,P_SPINP(c)::R1(A),XP(c)
    • Q(a);N_SPINP(f),OGATE,P_PINP(C),P_SPINP(c)::R1(A),XP(c)
    • Q(a);CHECK,N_SPINP(f),OGATE,P_SPINP(c)::P(C),XQ(a)
    • Q(a);CHECK,N_GUARD,N_SPINP(f),P_SPINP(c)::QAR2(K),XQ(a)
    • Q(a);N_GUARD,XR(A)::QAR2(K)
    • Q(a);N_GUARD,N_SPINP(f),P_SPINP(c),XP(B)::QAR2(K)
    • Q(a);CHECK,N_SPINP(f),OGATE,P_SPINP(c),XP(C)::QAB(K),XQ(a)
    • S(i);N_GUARD::QAB1(K),XS(g)
    • P(c);P_SPINQ(a),XP(B)::QAR2(K)
  • Tries
    • Try
      • R(A);N_PINP(f),P_PINP(c),XQ(a)
      • Threat
        • DUALS(2)
      • Refutation
        • P(b);N_SPINP(c),P_SPINP(f),XR(A)
    • Try
      • R(F);
      • Threat
        • B(L),XP(f)
      • Vars
        • Q(a);CHECK,N_SPINP(f),OGATE,P_SPINP(c)::P(C),XQ(a)
        • Q(a);CHECK,N_GUARD,N_SPINP(f),P_SPINP(c)::QAR2(K),XQ(a)
        • Q(a);CHECK,N_SPINP(f),OGATE,P_SPINP(c),XP(C)::QAB(K),XQ(a)
      • Refutation
        • P(h);
    • Try
      • P(J);XP(h)
      • Vars
        • Q(a);CHECK,N_SPINP(f),OGATE,P_SPINP(c)::P(C),XQ(a)
        • Q(a);CHECK,N_GUARD,N_SPINP(f),P_SPINP(c)::QAR2(K),XQ(a)
        • Q(a);CHECK,N_SPINP(f),OGATE,P_SPINP(c),XP(C)::QAB(K),XQ(a)
        • Q(a);N_GUARD,XR(A)::QAR2(K)
        • Q(a);N_GUARD,N_SPINP(f),P_SPINP(c),XP(B)::QAR2(K)
        • P(c);P_SPINQ(a),XP(B)::QAR2(K)
        • Q(a);N_SPINP(f),OGATE,P_SPINP(c)::R1(A),XP(c)
        • Q(a);N_SPINP(f),OGATE,P_PINP(C),P_SPINP(c)::R1(A),XP(c)
        • S(i);N_GUARD::QAB1(K),XS(g)
      • Refutation
        • Q(a);N_SPINP(f),P_SPINP(c)
  • Actual
    • S(G);XP(c)
    • Threat
      • R(F)+S(H)
    • Vars
      • Q(a);CHECK::R(F)+S(H),XQ(a)
      • Q(a);CHECK::R(A)+S(G),XQ(a)
      • Q(a);CHECK,XP(C)::R(A)+S(G),XQ(a)
      • K(d);N_SPINP(f),N_SPINS(g),P-FLIGHT,XB(I)::S(H)
      • Q(a);::R(A)+S(G),XQ(a)
      • S(i);N_GUARD::QAB1(K),XS(g)
HTML5 logo

Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).